assert failed: (mp->mnt_iflag & IMNT_GONE) == 0

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syzbot

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Nov 22, 2020, 10:27:19 AM11/22/20

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Hello,

syzbot found the following issue on:

HEAD commit: 579c1bef make(1): clean up comments for Suff_AddInclude an..
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=177726d1500000
kernel config: https://syzkaller.appspot.com/x/.config?x=1420f906d33d9f1f
dashboard link: https://syzkaller.appspot.com/bug?extid=f8bab6e5f08bae7b5c83
compiler: g++ (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f8bab6...@syzkaller.appspotmail.com

[ 126.4066540] panic: kernel diagnostic assertion "(mp->mnt_iflag & IMNT_GONE) == 0" failed: file "/syzkaller/managers/netbsd-kubsan/kernel/sys/kern/vfs_mount.c", line 880
[ 126.4274292] cpu0: Begin traceback...
[ 126.4766199] vpanic() at netbsd:vpanic+0x2cd sys/kern/subr_prf.c:290
[ 126.6166169] db_print_address.cold() at netbsd:db_print_address.cold
[ 126.7566210] dounmount() at netbsd:dounmount+0x5c5 sys/kern/vfs_mount.c:880
[ 126.9066181] sys_unmount() at netbsd:sys_unmount+0x224 sys/kern/vfs_syscalls.c:634
[ 127.0366196] sys___syscall() at netbsd:sys___syscall+0x1cf sy_call sys/sys/syscallvar.h:66 [inline]
[ 127.0366196] sys___syscall() at netbsd:sys___syscall+0x1cf sys/kern/sys_syscall.c:77
[ 127.1766171] syscall() at netbsd:syscall+0x2d5 sy_call sys/sys/syscallvar.h:65 [inline]
[ 127.1766171] syscall() at netbsd:syscall+0x2d5 sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 127.1766171] syscall() at netbsd:syscall+0x2d5 sys/arch/x86/x86/syscall.c:138
[ 127.2066192] --- syscall (number 198) ---
[ 127.2466179] netbsd:syscall+0x2d5:
[ 127.2466179] cpu0: End traceback...
[ 127.2466179] fatal breakpoint trap in supervisor mode
[ 127.2597081] trap type 1 code 0 rip 0xffffffff80221a85 cs 0x8 rflags 0x246 cr2 0x73268b4138e0 ilevel 0 rsp 0xffffa380d4527d60
[ 127.2726913] curlwp 0xffffa2b3a45d1580 pid 899.766 lowest kstack 0xffffa380d45232c0
Stopped in pid 899.766 (syz-executor.5) at netbsd:breakpoint+0x5: leave
?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0xec sys/ddb/db_panic.c:67
vpanic() at netbsd:vpanic+0x2cd sys/kern/subr_prf.c:290
db_print_address.cold() at netbsd:db_print_address.cold
dounmount() at netbsd:dounmount+0x5c5 sys/kern/vfs_mount.c:880
sys_unmount() at netbsd:sys_unmount+0x224 sys/kern/vfs_syscalls.c:634
sys___syscall() at netbsd:sys___syscall+0x1cf sy_call sys/sys/syscallvar.h:66 [inline]
sys___syscall() at netbsd:sys___syscall+0x1cf sys/kern/sys_syscall.c:77
syscall() at netbsd:syscall+0x2d5 sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x2d5 sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x2d5 sys/arch/x86/x86/syscall.c:138
--- syscall (number 198) ---
netbsd:syscall+0x2d5:
Panic string: kernel diagnostic assertion "(mp->mnt_iflag & IMNT_GONE) == 0" failed: file "/syzkaller/managers/netbsd-kubsan/kernel/sys/kern/vfs_mount.c", line 880
PID LID S CPU FLAGS STRUCT LWP * NAME WAIT
4920 5223 2 0 0 ffffa2b3a9c27240 syz-executor.3
4920 898 2 0 0 ffffa2b3a4775180 syz-executor.3
4920 3916 2 0 0 ffffa2b3a8bc7540 syz-executor.3
4920 4819 2 0 0 ffffa2b3a87926c0 syz-executor.3
4920 4920 2 1 10040000 ffffa2b3a8ade9c0 syz-executor.3
901 901 3 1 40000 ffffa2b3a8792b00 syz-executor.1 fstchg
760 760 2 0 0 ffffa2b3a9be4a80 syz-executor.0
5444 5444 3 0 40180 ffffa2b3a6faf1c0 syz-executor.0 parked
5155 5155 3 0 40180 ffffa2b3a8ade140 syz-executor.0 parked
4640 4410 2 0 100 ffffa2b3a4775a00 syz-executor.4
4640 4640 2 0 10040000 ffffa2b3a9dd1600 syz-executor.4
899 > 766 7 0 0 ffffa2b3a45d1580 syz-executor.5
899 5058 3 0 180 ffffa2b3a6faf600 syz-executor.5 parked
899 899 2 0 10040000 ffffa2b3a82ee300 syz-executor.5
761 761 3 1 40180 ffffa2b3a8792280 syz-executor.4 parked
4966 4966 3 1 180 ffffa2b3a9be4200 syz-executor.1 parked
765 753 2 0 100 ffffa2b3a810f640 syz-executor.0
765 765 2 0 10040000 ffffa2b3a45d1140 syz-executor.0
900 5046 2 0 0 ffffa2b3a9c27ac0 syz-executor.2
900 897 2 0 0 ffffa2b3a9c27680 syz-executor.2
900 5071 3 1 180 ffffa2b3a826dbc0 syz-executor.2 parked
900 4295 2 0 100 ffffa2b3a9be4640 syz-executor.2
900 900 2 1 10040000 ffffa2b3a8902480 syz-executor.2
762 762 3 1 180 ffffa2b3a8da9500 syz-executor.4 parked
754 754 3 1 180 ffffa2b3a8b612c0 syz-executor.4 parked
749 749 3 1 180 ffffa2b3a8b61b40 syz-executor.1 parked
752 752 3 0 180 ffffa2b3a85e7900 syz-executor.5 parked
989 989 3 0 180 ffffa2b3a9dd11c0 syz-executor.3 parked
1721 1721 3 0 180 ffffa2b3a47755c0 syz-executor.1 parked
1725 1725 3 1 180 ffffa2b3a9db1a00 syz-executor.1 parked
5062 5062 3 0 180 ffffa2b3a810fa80 syz-executor.3 parked
545 545 3 0 180 ffffa2b3a9dd1a40 syz-executor.3 parked
654 654 3 1 180 ffffa2b3a9db1180 syz-executor.3 parked
4651 4651 3 0 180 ffffa2b3a8b61700 syz-executor.3 parked
495 495 3 0 180 ffffa2b3a810f200 syz-executor.3 parked
491 491 3 0 180 ffffa2b3a8da9940 syz-executor.5 parked
489 489 3 0 180 ffffa2b3a90e8680 syz-executor.5 parked
4707 4707 3 1 180 ffffa2b39d1e0980 syz-executor.5 parked
4397 4397 3 0 180 ffffa2b3a8ade580 syz-executor.4 parked
4584 4584 3 0 180 ffffa2b3a85e7080 syz-executor.3 parked
4184 4184 3 1 180 ffffa2b3a90e8ac0 syz-executor.5 parked
4436 4436 3 0 180 ffffa2b3a8bc7980 syz-executor.4 parked
4155 4155 3 1 180 ffffa2b3a8bc7100 syz-executor.2 parked
4421 4421 3 0 180 ffffa2b3a82ee740 syz-executor.2 parked
4553 4553 3 0 180 ffffa2b3a8da90c0 syz-executor.5 parked
3528 3528 3 1 180 ffffa2b3a826d780 syz-executor.4 parked
4391 4391 3 1 180 ffffa2b3a826d340 syz-executor.4 parked
4171 4171 3 1 180 ffffa2b3a8902040 syz-executor.4 parked
3265 3265 3 0 180 ffffa2b3a89028c0 syz-executor.4 parked
4419 4419 3 0 180 ffffa2b3a82eeb80 syz-executor.3 parked
1151 1151 2 1 140 ffffa2b3a45d19c0 syz-executor.5
1101 1101 2 0 140 ffffa2b39d1e0540 syz-executor.3
1105 1105 2 1 140 ffffa2b39d1e0100 syz-executor.4
1073 1073 2 1 140 ffffa2b399f13940 syz-executor.2
1192 >1192 7 1 140 ffffa2b399f13500 syz-executor.1
420 420 2 1 140 ffffa2b398ee7480 syz-executor.0
1071 1086 3 0 1c0 ffffa2b398d7e4c0 syz-fuzzer parked
1071 1085 3 0 180 ffffa2b398a38780 syz-fuzzer kqueue
1071 1076 3 0 1c0 ffffa2b397beb240 syz-fuzzer parked
1071 1079 3 0 180 ffffa2b397814600 syz-fuzzer parked
1071 1081 3 1 180 ffffa2b398085300 syz-fuzzer parked
1071 944 3 0 180 ffffa2b398085b80 syz-fuzzer parked
1071 1077 3 1 180 ffffa2b397beb680 syz-fuzzer parked
1071 1074 3 1 180 ffffa2b397bebac0 syz-fuzzer parked
1071 1071 3 0 180 ffffa2b397857a80 syz-fuzzer parked
1070 1070 3 0 180 ffffa2b398a38340 sshd select
1249 1249 3 1 180 ffffa2b399f130c0 getty nanoslp
857 857 3 1 180 ffffa2b398ee7040 getty nanoslp
947 947 3 1 180 ffffa2b398ee78c0 getty nanoslp
1104 1104 3 0 1c0 ffffa2b397cbf280 getty ttyraw
956 956 3 1 180 ffffa2b398d7e080 sshd select
869 869 3 0 180 ffffa2b397e9b2c0 powerd kqueue
554 554 3 0 180 ffffa2b38f5922c0 syslogd kqueue
599 599 3 1 180 ffffa2b398d7e900 dhcpcd poll
598 598 3 1 180 ffffa2b398085740 dhcpcd poll
597 597 3 1 180 ffffa2b398a38bc0 dhcpcd poll
462 462 3 0 180 ffffa2b397e9b700 dhcpcd poll
350 350 3 1 180 ffffa2b397cbf6c0 dhcpcd poll
349 349 3 1 180 ffffa2b397cbfb00 dhcpcd poll
348 348 3 0 180 ffffa2b397e9bb40 dhcpcd poll
1 1 3 0 180 ffffa2b38f663940 init wait
0 4826 5 1 600 ffffa2b3a85e74c0 (zombie)
0 1535 3 1 200 ffffa2b3a90e8240 acctwatch actwat
0 796 3 1 200 ffffa2b397814a40 physiod physiod
0 192 2 0 240 ffffa2b397857640 ioflush
0 166 3 0 200 ffffa2b38f592700 pooldrain pooldrain
0 165 3 1 200 ffffa2b397857200 pgdaemon pgdaemon
0 162 3 1 200 ffffa2b3978141c0 usb7 usbevt
0 161 3 1 200 ffffa2b39474fa00 usb6 usbevt
0 31 3 0 200 ffffa2b39474f5c0 usb5 usbevt
0 63 3 0 200 ffffa2b39474f180 usb4 usbevt
0 126 3 1 200 ffffa2b39171a9c0 usb3 usbevt
0 125 3 0 200 ffffa2b39171a580 usb2 usbevt
0 124 3 0 200 ffffa2b39171a140 usb1 usbevt
0 123 3 1 200 ffffa2b3906e2980 usb0 usbevt
0 122 3 1 200 ffffa2b3906e2540 usbtask-dr usbtsk
0 121 3 1 200 ffffa2b3906e2100 usbtask-hc usbtsk
0 120 3 0 200 ffffa2b38cab3ac0 npfgc0 npfgcw
0 119 3 1 200 ffffa2b38f663500 rt_free rt_free
0 118 3 1 200 ffffa2b38f6630c0 unpgc unpgc
0 117 2 0 200 ffffa2b38f64e900 key_timehandler
0 116 3 1 200 ffffa2b38f64e4c0 icmp6_wqinput/1 icmp6_wqinput
0 115 3 0 200 ffffa2b38f64e080 icmp6_wqinput/0 icmp6_wqinput
0 114 3 0 200 ffffa2b38f6218c0 nd6_timer nd6_timer
0 113 3 1 200 ffffa2b38f621480 carp6_wqinput/1 carp6_wqinput
0 112 3 0 200 ffffa2b38f621040 carp6_wqinput/0 carp6_wqinput
0 111 3 1 200 ffffa2b38f60cbc0 carp_wqinput/1 carp_wqinput
0 110 3 0 200 ffffa2b38f60c780 carp_wqinput/0 carp_wqinput
0 109 3 1 200 ffffa2b38f60c340 icmp_wqinput/1 icmp_wqinput
0 108 3 0 200 ffffa2b38f597b80 icmp_wqinput/0 icmp_wqinput
0 107 3 0 200 ffffa2b38f597740 rt_timer rt_timer
0 106 3 1 200 ffffa2b38f592b40 vmem_rehash vmem_rehash
0 105 3 1 200 ffffa2b38f597300 entbutler entropy
0 96 3 1 200 ffffa2b38ef23b00 viomb balloon
0 30 3 1 200 ffffa2b38ef236c0 vioif0_txrx/1 vioif0_txrx
0 29 3 0 200 ffffa2b38ef23280 vioif0_txrx/0 vioif0_txrx
0 27 3 0 200 ffffa2b38cab3680 scsibus0 sccomp
0 26 3 0 200 ffffa2b38cab3240 pms0 pmsreset
0 25 3 1 200 ffffa2b38ca04a80 xcall/1 xcall
0 24 1 1 200 ffffa2b38ca04640 softser/1
0 23 1 1 200 ffffa2b38ca04200 softclk/1
0 22 1 1 200 ffffa2b38c9dfa40 softbio/1
0 21 1 1 200 ffffa2b38c9df600 softnet/1
0 20 1 1 201 ffffa2b38c9df1c0 idle/1
0 19 3 1 200 ffffa2b4bb949a00 lnxpwrwq lnxpwrwq
0 18 3 1 200 ffffa2b4bb9495c0 lnxlngwq lnxlngwq
0 17 3 0 200 ffffa2b4bb949180 lnxsyswq lnxsyswq
0 16 3 0 200 ffffa2b4bb9649c0 lnxrcugc lnxrcugc
0 15 3 0 200 ffffa2b4bb964580 sysmon smtaskq
0 14 3 1 200 ffffa2b4bb964140 pmfsuspend pmfsuspend
0 13 3 0 200 ffffa2b4bb973980 pmfevent pmfevent
0 12 3 0 200 ffffa2b4bb973540 sopendfree sopendfr
0 11 3 1 200 ffffa2b4bb973100 iflnkst iflnkst
0 10 3 0 200 ffffa2b4bc99e940 nfssilly nfssilly
0 9 3 0 200 ffffa2b4bc99e500 vdrain vdrain
0 8 3 0 200 ffffa2b4bc99e0c0 modunload mod_unld
0 7 3 0 200 ffffa2b4bc9d3900 xcall/0 xcall
0 6 1 0 200 ffffa2b4bc9d34c0 softser/0
0 5 1 0 200 ffffa2b4bc9d3080 softclk/0
0 4 1 0 200 ffffa2b4bc9fd8c0 softbio/0
0 3 1 0 200 ffffa2b4bc9fd480 softnet/0
0 2 1 0 201 ffffa2b4bc9fd040 idle/0
0 0 3 1 200 ffffffff85edc280 swapper uvm
[Locks tracked through LWPs]

****** LWP 901.901 (syz-executor.1) @ 0xffffa2b3a8792b00, l_stat=3

*** Locks held:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffffa2b3a7dadb80 type : sleep/adaptive
initialized : 0xffffffff80f5060e
shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 1
relevant lwp : 0xffffa2b3a8792b00 last held: 0xffffa2b3a8792b00
last locked* : 0xffffffff80f52cba unlocked : 0xffffffff80f50346
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 899.766 (syz-executor.5) @ 0xffffa2b3a45d1580, l_stat=7

*** Locks held:

* Lock 0 (initialized at fstrans_init)
lock address : 0xffffffff862e0400 type : sleep/adaptive
initialized : 0xffffffff835088ca
shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffa2b3a45d1580 last held: 0xffffa2b3a45d1580
last locked* : 0xffffffff8350d814 unlocked : 0xffffffff834ea35d
owner field : 0xffffa2b3a45d1580 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 765.765 (syz-executor.0) @ 0xffffa2b3a45d1140, l_stat=2

*** Locks held:

* Lock 0 (initialized at uvm_map_setup)
lock address : 0xffffa2b3a8582b68 type : sleep/adaptive
initialized : 0xffffffff8314f042
shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffa2b3a45d1140 last held: 0xffffa2b3a45d1140
last locked* : 0xffffffff83141cdf unlocked : 0xffffffff8312f3b9
owner/count : 0xffffa2b3a45d1140 flags : 0x0000000000000004
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 598.598 (dhcpcd) @ 0xffffa2b398085740, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d6340 type : sleep/adaptive
initialized : 0xffffffff83257917
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffffa2b398085740 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 597.597 (dhcpcd) @ 0xffffa2b398a38bc0, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d6340 type : sleep/adaptive
initialized : 0xffffffff83257917
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffffa2b398a38bc0 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 349.349 (dhcpcd) @ 0xffffa2b397cbfb00, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d6340 type : sleep/adaptive
initialized : 0xffffffff83257917
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffffa2b397cbfb00 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 348.348 (dhcpcd) @ 0xffffa2b397e9bb40, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d6340 type : sleep/adaptive
initialized : 0xffffffff83257917
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0
relevant lwp : 0xffffa2b397e9bb40 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.23 (softclk/1) @ 0xffffa2b38ca04200, l_stat=1

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d6340 type : sleep/adaptive
initialized : 0xffffffff83257917
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffffa2b38ca04200 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

****** LWP 0.11 (iflnkst) @ 0xffffa2b4bb973100, l_stat=3

*** Locks held: none

*** Locks wanted:

* Lock 0 (initialized at module_hook_init)
lock address : 0xffffffff862d6340 type : sleep/adaptive
initialized : 0xffffffff83257917
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 0
relevant lwp : 0xffffa2b4bb973100 last held: 000000000000000000
last locked : 000000000000000000 unlocked*: 000000000000000000
owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

[Locks tracked through CPUs]

******* Locks held on cpu1:

* Lock 0 (initialized at sched_cpuattach)
lock address : 0xffffa2b4bce81340 type : spin
initialized : 0xffffffff83296e90
shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 1
relevant lwp : 0xffffa2b399f13500 last held: 0xffffa2b3a8902480
last locked* : 0xffffffff83270811 unlocked : 0xffffffff833dc8b9
owner field : 0x0000000000000700 wait/spin: 0/1

PAGE FLAG PQ UOBJECT UANON
0xffffa38000007180 0045 00000000 0x0 0x0
0xffffa38000007200 0045 00000000 0x0 0x0
0xffffa38000007280 0045 00000000 0x0 0x0
0xffffa38000007300 0045 00000000 0x0 0x0
0xffffa38000007380 0045 00000000 0x0 0x0
0xffffa38000007400 0045 00000000 0x0 0x0
0xffffa38000007480 0045 00000000 0x0 0x0
0xffffa38000007500 0045 00000000 0x0 0x0
0xffffa38000007580 0045 00000000 0x0 0x0
0xffffa38000007600 0045 00000000 0x0 0x0
0xffffa38000007680 0041 00000000 0x0 0x0
0xffffa38000007700 0041 00000000 0x0 0x0
0xffffa38000007780 0041 00000000 0x0 0x0
0xffffa38000007800 0041 00000000 0x0 0x0
0xffffa38000007880 0041 00000000 0x0 0x0
0xffffa38000007900 0045 00000000 0x0 0x0
0xffffa38000007980 0041 00000000 0x0 0x0
0xffffa38000007a00 0041 00000000 0x0 0x0
0xffffa38000007a80 0041 00000000 0x0 0x0
0xffffa38000007b00 0041 00000000 0x0 0x0
0xffffa38000007b80 0041 00000000 0x0 0x0
0xffffa38000007c00 0041 00000000 0x0 0x0
0xffffa38000007c80 0041 00000000 0x0 0x0
0xffffa38000007d00 0041 00000000 0x0 0x0
0xffffa38000007d80 0041 00000000 0x0 0x0
0xffffa38000007e00 0041 00000000 0x0 0x0
0xffffa38000007e80 0041 00000000 0x0 0x0
0xffffa38000007f00 0041 00000000 0x0 0x0
0xffffa38000007f80 0041 00000000 0x0 0x0
0xffffa38000008000 0041 00000000 0x0 0x0
0xffffa38000008080 0041 00000000 0x0 0x0
0xffffa38000008100 0041 00000000 0x0 0x0
0xffffa38000008180 0041 00000000 0x0 0x0
0xffffa38000008200 0041 00000000 0x0 0x0
0xffffa38000008280 0041 00000000 0x0 0x0
0xffffa38000008300 0041 00000000 0x0 0x0
0xffffa38000008380 0041 00000000 0x0 0x0
0xffffa38000008400 0041 00000000 0x0 0x0
0xffffa38000008480 0041 00000000 0x0 0x0
0xffffa38000008500 0041 00000000 0x0 0x0
0xffffa38000008580 0041 00000000 0x0 0x0
0xffffa38000008600 0041 00000000 0x0 0x0
0xffffa38000008680 0041 00000000 0x0 0x0
0xffffa38000008700 0041 00000000 0x0 0x0
0xffffa38000008780 0041 00000000 0x0 0x0
0xffffa38000008800 0041 00000000 0x0 0x0
0xffffa38000008880 0041 00000000 0x0 0x0
0xffffa38000008900 0041 00000000 0x0 0x0
0xffffa38000008980 0041 00000000 0x0 0x0
0xffffa38000008a00 0041 00000000 0x0 0x0
0xffffa38000008a80 0041 00000000 0x0 0x0
0xffffa38000008b00 0041 00000000 0x0 0x0
0xffffa38000008b80 0041 00000000 0x0 0x0
0xffffa38000008c00 0041 00000000 0x0 0x0
0xffffa38000008c80 0045 00000000 0x0 0x0
0xffffa38000008d00 0041 00000000 0x0 0x0
0xffffa38000008d80 0045 00000000 0x0 0x0
0xffffa38000008e00 0041 00000000 0x0 0x0
0xffffa38000008e80 0041 00000000 0x0 0x0
0xffffa38000008f00 0041 00000000 0x0 0x0
0xffffa38000008f80 0041 00000000 0x0 0x0
0xffffa38000009000 0041 00000000 0x0 0x0
0xffffa38000009080 0041 00000000 0x0 0x0
0xffffa38000009100 0041 00000000 0x0 0x0
0xffffa38000009180 0041 00000000 0x0 0x0
0xffffa38000009200 0041 00000000 0x0 0x0
0xffffa38000009280 0041 00000000 0x0 0x0
0xffffa38000009300 0041 00000000 0x0 0x0
0xffffa38000009380 0041 00000000 0x0 0x0
0xffffa38000009400 0041 00000000 0x0 0x0
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0xffffa38000017400 0001 00000000 0x0 0x0
0xffffa38000017480 0001 00000000 0x0 0x0
0xffffa38000017500 0001 00000000 0x0 0x0
0xffffa38000017580 0001 00000000 0x0 0x0
0xffffa38000017600 0001 00000000 0x0 0x0
0xffffa38000017680 0001 00000000 0x0 0x0
0xffffa38000017700 0001 00000000 0x0 0x0
0xffffa38000017780 0001 00000000 0x0 0x0
0xffffa38000017800 0001 00000000 0x0 0x0
0xffffa38000017880 0001 00000000 0x0 0x0
0xffffa38000017900 0001 00000000 0x0 0x0
0xffffa38000017980 0001 00000000 0x0 0x0
0xffffa38000017a00 0001 00000000 0x0 0x0
0xffffa38000017a80 0001 00000000 0x0 0x0
0xffffa38000017b00 0001 00000000 0x0 0x0
0xffffa38000017b80 0001 00000000 0x0 0x0
0xffffa38000017c00 0001 00000000 0x0 0x0
0xffffa38000017c80 0001 00000000 0x0 0x0
0xffffa38000017d00 0001 00000000 0x0 0x0
0xffffa38000017d80 0001 00000000 0x0 0x0
0xffffa38000017e00 0001 00000000 0x0 0x0
0xffffa38000017e80 0001 00000000 0x0 0x0
0xffffa38000017f00 0001 00000000 0x0 0x0
0xffffa38000017f80 0001 00000000 0x0 0x0
0xffffa38000018000 0001 00000000 0x0 0x0
0xffffa38000018080 0001 00000000 0x0 0x0
0xffffa38000018100 0001 00000000 0x0 0x0
0xffffa38000018180 0001 00000000 0x0 0x0
0xffffa38000018200 0001 00000000 0x0 0x0
0xffffa38000018280 0001 00000000 0x0 0x0
0xffffa38000018300 0001 00000000 0x0 0x0
0xffffa38000018380 0001 00000000 0x0 0x0
0xffffa38000018400 0001 00000000 0x0 0x0
0xffffa38000018480 0001 00000000 0x0 0x0
0xffffa38000018500 0001 00000000 0x0 0x0
0xffffa38000018580 0001 00000000 0x0 0x0
0xffffa38000018600 0001 00000000 0x0 0x0
0xffffa38000018680 0001 00000000 0x0 0x0
0xffffa38000018700 0001 00000000 0x0 0x0
0xffffa38000018780 0001 00000000 0x0 0x0
0xffffa38000018800 0001 00000000 0x0 0x0
0xffffa38000018880 0001 00000000 0x0 0x0
0xffffa38000018900 0001 00000000 0x0 0x0
0xffffa38000018980 0001 00000000 0x0 0x0
0xffffa38000018a00 0001 00000000 0x0 0x0
0xffffa38000018a80 0001 00000000 0x0 0x0
0xffffa38000018b00 0001 00000000 0x0 0x0
0xffffa38000018b80 0001 00000000 0x0 0x0
0xffffa38000018c00 0001 00000000 0x0 0x0
0xffffa38000018c80 0041 00000000 0x0 0x0
0xffffa38000018d00 0041 00000000 0x0 0x0
0xffffa38000018d80 0041 00000000 0x0 0x0
0xffffa38000018e00 0041 00000000 0x0 0x0
0xffffa38000018e80 0041 00000000 0x0 0x0
0xffffa38000018f00 0041 00000000 0x0 0x0
0xffffa38000018f80 0041 00000000 0x0 0x0
0xffffa38000019000 0041 00000000 0x0 0x0
0xffffa38000019080 0041 00000000 0x0 0x0
0xffffa38000019100 0041 00000000 0x0 0x0
0xffffa38000019180 0041 00000000 0x0 0x0
0xffffa38000019200 0041 00000000 0x0 0x0
0xffffa38000019280 0041 00000000 0x0 0x0
0xffffa38000019300 0041 00000000 0x0 0x0
0xffffa38000019380 0041 00000000 0x0 0x0
0xffffa38000019400 0041 00000000 0x0 0x0
0xffffa38000019480 0041 00000000 0x0 0x0
0xffffa38000019500 0041 00000000 0x0 0x0
0xffffa38000019580 0041 00000000 0x0 0x0
0xffffa38000019600 0045 00000000 0x0 0x0
0xffffa38000019680 0041 00000000 0x0 0x0
0xffffa38000019700 0041 00000000 0x0 0x0
0xffffa38000019780 0041 00000000 0x0 0x0
0xffffa38000019800 0041 00000000 0x0 0x0
0xffffa38000019880 0041 00000000 0x0 0x0
0xffffa38000019900 0041 00000000 0x0 0x0
0xffffa38000019980 0045 00000000 0x0 0x0
0xffffa38000019a00 0045 00000000 0x0 0x0
0xffffa38000019a80 0041 00000000 0x0 0x0
0xffffa38000019b00 0041 00000000 0x0 0x0
0xffffa38000019b80 0041 00000000 0x0 0x0
0xffffa38000019c00 0045 00000000 0x0 0x0
0xffffa38000019c80 0041 00000000 0x0 0x0
0xffffa38000019d00 0041 00000000 0x0 0x0
0xffffa38000019d80 0045 00000000 0x0 0x0
0xffffa38000019e00 0045 00000000 0x0 0x0
0xffffa38000019e80 0041 00000000 0x0 0x0
0xffffa38000019f00 0045 00000000 0x0 0x0
0xffffa38000019f80 0041 00000000 0x0 0x0
0xffffa3800001a000 0045 00000000 0x0 0x0
0xffffa3800001a080 0041 00000000 0x0 0x0
0xffffa3800001a100 0041 00000000 0x0 0x0
0xffffa3800001a180 0045 00000000 0x0 0x0
0xffffa3800001a200 0045 00000000 0x0 0x0
0xffffa3800001a280 0041 00000000 0x0 0x0
0xffffa3800001a300 0045 00000000 0x0 0x0
0xffffa3800001a380 0041 00000000 0x0 0x0
0xffffa3800001a400 0045 00000000 0x0 0x0
0xffffa3800001a480 0041 00000000 0x0 0x0
0xffffa3800001a500 0001 00000000 0x0 0x0
0xffffa3800001a580 0001 00000000 0x0 0x0
0xffffa3800001a600 0001 00000000 0x0 0x0
0xffffa3800001a680 0001 00000000 0x0 0x0
0xffffa3800001a700 0001 00000000 0x0 0x0
0xffffa3800001a780 0001 00000000 0x0 0x0
0xffffa3800001a800 0001 00000000 0x0 0x0
0xffffa3800001a880 0001 00000000 0x0 0x0
0xffffa3800001a900 0001 00000000 0x0 0x0
0xffffa3800001a980 0001 00000000 0x0 0x0
0xffffa3800001aa00 0001 00000000 0x0 0x0
0xffffa3800001aa80 0001 00000000 0x0 0x0
0xffffa3800001ab00 0001 00000000 0x0 0x0
0xffffa3800001ab80 0001 00000000 0x0 0x0
0xffffa3800001ac00 0001 00000000 0x0 0x0
0xffffa3800001ac80 0001 00000000 0x0 0x0
0xffffa3800001ad00 0001 00000000 0x0 0x0
0xffffa3800001ad80 0001 00000000 0x0 0x0
0xffffa3800001ae00 0001 00000000 0x0 0x0
0xffffa3800001ae80 0001 00000000 0x0 0x0
0xffffa3800001af00 0001 00000000 0x0 0x0
0xffffa3800001af80 0001 00000000 0x0 0x0
0xffffa3800001b000 0001 00000000 0x0 0x0
0xffffa3800001b080 0001 00000000 0x0 0x0
0xffffa3800001b100 0001 00000000 0x0 0x0
0xffffa3800001b180 0001 00000000 0x0 0x0
0xffffa3800001b200 0001 00000000 0x0 0x0
0xffffa3800001b280 0001 00000000 0x0 0x0
0xffffa3800001b300 0001 00000000 0x0 0x0
0xffffa3800001b380 0001 00000000 0x0 0x0
0xffffa3800001b400 0001 00000000 0x0 0x0
0xffffa3800001b480 0001 00000000 0x0 0x0
0xffffa3800001b500 0001 00000000 0x0 0x0
0xffffa3800001b580 0001 00000000 0x0 0x0
0xffffa3800001b600 0001 00000000 0x0 0x0
0xffffa3800001b680 0001 00000000 0x0

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

syzbot

unread,

Nov 22, 2020, 11:32:17 AM11/22/20

to syzkaller-...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: 579c1bef make(1): clean up comments for Suff_AddInclude an..
git tree: netbsd

console output: https://syzkaller.appspot.com/x/log.txt?x=16887e8e500000
kernel config: https://syzkaller.appspot.com/x/.config?x=739e57438eb9ed9e
dashboard link: https://syzkaller.appspot.com/bug?extid=f8bab6e5f08bae7b5c83
compiler: clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1568647d500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11975015500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f8bab6...@syzkaller.appspotmail.com

[ 85.9284803] panic: kernel diagnostic assertion "(mp->mnt_iflag & IMNT_GONE) == 0" failed: file "/syzkaller/managers/netbsd-kmsan/kernel/sys/kern/vfs_mount.c", line 880
[ 85.9533406] cpu0: Begin traceback...
[ 85.9984446] vpanic() at netbsd:vpanic+0x91a sys/kern/subr_prf.c:288
[ 86.1084460] kern_assert() at netbsd:kern_assert+0x214
[ 86.2184529] dounmount() at netbsd:dounmount+0x470 sys/kern/vfs_mount.c:880
[ 86.3284457] sys_unmount() at netbsd:sys_unmount+0x632 sys/kern/vfs_syscalls.c:634
[ 86.4384470] sys_syscall() at netbsd:sys_syscall+0x2a1 sy_call sys/sys/syscallvar.h:65 [inline]
[ 86.4384470] sys_syscall() at netbsd:sys_syscall+0x2a1 sys/kern/sys_syscall.c:77
[ 86.5584473] syscall() at netbsd:syscall+0x42d sy_call sys/sys/syscallvar.h:65 [inline]
[ 86.5584473] syscall() at netbsd:syscall+0x42d sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 86.5584473] syscall() at netbsd:syscall+0x42d sys/arch/x86/x86/syscall.c:138
[ 86.5884495] --- syscall (number 0) ---
[ 86.6184473] netbsd:syscall+0x42d:
[ 86.6292844] cpu0: End traceback...
[ 86.6292844] fatal breakpoint trap in supervisor mode
[ 86.6292844] trap type 1 code 0 rip 0xffffffff8022286d cs 0x8 rflags 0x246 cr2 0x7e9def67cc50 ilevel 0 rsp 0xffffd880879dd9f0
[ 86.6495429] curlwp 0xffffd880134bd140 pid 1202.1200 lowest kstack 0xffffd880879d62c0
Stopped in pid 1202.1200 (syz-executor1571) at netbsd:breakpoint+0x5: leave

?
breakpoint() at netbsd:breakpoint+0x5

vpanic() at netbsd:vpanic+0x91a sys/kern/subr_prf.c:288
kern_assert() at netbsd:kern_assert+0x214
dounmount() at netbsd:dounmount+0x470 sys/kern/vfs_mount.c:880
sys_unmount() at netbsd:sys_unmount+0x632 sys/kern/vfs_syscalls.c:634
sys_syscall() at netbsd:sys_syscall+0x2a1 sy_call sys/sys/syscallvar.h:65 [inline]
sys_syscall() at netbsd:sys_syscall+0x2a1 sys/kern/sys_syscall.c:77
syscall() at netbsd:syscall+0x42d sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x42d sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x42d sys/arch/x86/x86/syscall.c:138
--- syscall (number 0) ---
netbsd:syscall+0x42d:
Panic string: kernel diagnostic assertion "(mp->mnt_iflag & IMNT_GONE) == 0" failed: file "/syzkaller/managers/netbsd-kmsan/kernel/sys/kern/vfs_mount.c", line 880

PID LID S CPU FLAGS STRUCT LWP * NAME WAIT

1128 1128 2 1 0 ffffd88012bcd8c0 syz-executor1571
1202 >1200 7 0 0 ffffd880134bd140 syz-executor1571
1202 1202 2 0 10000000 ffffd88013367940 syz-executor1571
1378 1378 2 1 0 ffffd88013378100 syz-executor1571
1201 985 2 0 0 ffffd880134c3180 syz-executor1571
1201 1197 2 0 0 ffffd88013378980 syz-executor1571
1201 1209 2 0 0 ffffd88013378540 syz-executor1571
1201 1201 2 1 10000000 ffffd880133670c0 syz-executor1571
1379 1379 2 1 0 ffffd88013358080 syz-executor1571
1254 1193 2 0 100 ffffd880134bd580 syz-executor1571
1254 >1254 7 1 10040000 ffffd88012bcd480 syz-executor1571
1104 1104 2 1 140 ffffd88013367500 syz-executor1571
1187 1187 2 1 140 ffffd88013358900 syz-executor1571
1077 1077 2 0 140 ffffd880133584c0 syz-executor1571
1080 1080 2 1 140 ffffd88012bcd040 syz-executor1571
1151 1151 2 1 140 ffffd880122c8ac0 syz-executor1571
1082 1082 2 1 140 ffffd880122c8680 syz-executor1571
1097 1097 3 0 40180 ffffd880122c8240 syz-executor1571 nanoslp
1107 1107 3 1 180 ffffd88012480700 sshd select
1056 1056 3 1 180 ffffd88012b21bc0 getty nanoslp
1094 1094 3 1 180 ffffd880121b7a80 getty nanoslp
1066 1066 3 1 180 ffffd880121b7640 getty nanoslp
699 699 3 1 1c0 ffffd88012132a00 getty ttyraw
958 958 3 1 180 ffffd88012b21780 sshd select
1125 1125 3 0 180 ffffd88012b21340 powerd kqueue
686 686 3 0 180 ffffd88012555300 syslogd kqueue
600 600 3 0 180 ffffd88012555b80 dhcpcd poll
596 596 3 1 180 ffffd880123aa280 dhcpcd poll
599 599 3 0 180 ffffd880123aab00 dhcpcd poll
612 612 3 0 180 ffffd88012555740 dhcpcd poll
481 481 3 1 180 ffffd88012480b40 dhcpcd poll
351 351 3 0 180 ffffd880123aa6c0 dhcpcd poll
350 350 3 0 180 ffffd880124802c0 dhcpcd poll
1 1 3 0 180 ffffd88011e930c0 init wait
0 962 3 0 200 ffffd880121b61c0 physiod physiod
0 192 3 0 200 ffffd880121b7200 pooldrain pooldrain
0 168 3 0 200 ffffd880121b6a40 ioflush syncer
0 167 3 1 200 ffffd880121b6600 pgdaemon pgdaemon
0 162 3 1 200 ffffd880121325c0 usb7 usbevt
0 161 3 0 200 ffffd88012132180 usb6 usbevt
0 31 3 1 200 ffffd880121029c0 usb5 usbevt
0 63 3 1 200 ffffd88012102580 usb4 usbevt
0 126 3 0 200 ffffd88012102140 usb3 usbevt
0 125 3 1 200 ffffd88012050980 usb2 usbevt
0 124 3 1 200 ffffd88012050540 usb1 usbevt
0 123 3 1 200 ffffd88012050100 usb0 usbevt
0 122 3 1 200 ffffd88011e93940 usbtask-dr usbtsk
0 121 3 1 200 ffffd88011e93500 usbtask-hc usbtsk
0 120 3 1 200 ffffd880103b7ac0 npfgc0 npfgcw
0 119 3 1 200 ffffd88011e87900 rt_free rt_free
0 118 3 1 200 ffffd88011e874c0 unpgc unpgc
0 117 2 0 200 ffffd88011e87080 key_timehandler
0 116 3 1 200 ffffd88011e828c0 icmp6_wqinput/1 icmp6_wqinput
0 115 3 0 200 ffffd88011e82480 icmp6_wqinput/0 icmp6_wqinput
0 114 2 0 200 ffffd88011e82040 nd6_timer
0 113 3 1 200 ffffd88011e7bbc0 carp6_wqinput/1 carp6_wqinput
0 112 3 0 200 ffffd88011e7b780 carp6_wqinput/0 carp6_wqinput
0 111 3 1 200 ffffd88011e7b340 carp_wqinput/1 carp_wqinput
0 110 3 0 200 ffffd88011c61b40 carp_wqinput/0 carp_wqinput
0 109 3 1 200 ffffd88011c61700 icmp_wqinput/1 icmp_wqinput
0 108 3 0 200 ffffd88011c612c0 icmp_wqinput/0 icmp_wqinput
0 107 2 0 200 ffffd88011c63b80 rt_timer
0 106 3 1 200 ffffd88011c63740 vmem_rehash vmem_rehash
0 105 3 1 200 ffffd88011c63300 entbutler entropy
0 96 3 0 200 ffffd880117a1b00 viomb balloon
0 30 3 1 200 ffffd880117a16c0 vioif0_txrx/1 vioif0_txrx
0 29 3 0 200 ffffd880117a1280 vioif0_txrx/0 vioif0_txrx
0 27 3 0 200 ffffd880103b7680 scsibus0 sccomp
0 26 3 0 200 ffffd880103b7240 pms0 pmsreset
0 25 3 1 200 ffffd880103a6a80 xcall/1 xcall
0 24 1 1 200 ffffd880103a6640 softser/1
0 23 1 1 200 ffffd880103a6200 softclk/1
0 22 1 1 200 ffffd880103a4a40 softbio/1
0 21 1 1 200 ffffd880103a4600 softnet/1
0 20 1 1 201 ffffd880103a41c0 idle/1
0 19 3 0 200 ffffd8800f220a00 lnxpwrwq lnxpwrwq
0 18 3 0 200 ffffd8800f2205c0 lnxlngwq lnxlngwq
0 17 3 0 200 ffffd8800f220180 lnxsyswq lnxsyswq
0 16 3 0 200 ffffd8800f21b9c0 lnxrcugc lnxrcugc
0 15 3 0 200 ffffd8800f21b580 sysmon smtaskq
0 14 3 0 200 ffffd8800f21b140 pmfsuspend pmfsuspend
0 13 3 0 200 ffffd8800f217980 pmfevent pmfevent
0 12 3 0 200 ffffd8800f217540 sopendfree sopendfr
0 11 3 1 200 ffffd8800f217100 iflnkst iflnkst
0 10 3 0 200 ffffd8800f20d940 nfssilly nfssilly
0 9 3 0 200 ffffd8800f20d500 vdrain vdrain
0 8 3 0 200 ffffd8800f20d0c0 modunload mod_unld
0 7 3 0 200 ffffd8800ec0a900 xcall/0 xcall
0 6 1 0 200 ffffd8800ec0a4c0 softser/0
0 5 1 0 200 ffffd8800ec0a080 softclk/0
0 4 1 0 200 ffffd8800ec088c0 softbio/0
0 3 1 0 200 ffffd8800ec08480 softnet/0
0 2 1 0 201 ffffd8800ec08040 idle/0
0 0 2 0 240 ffffffff86250440 swapper
[Locks tracked through LWPs]

****** LWP 1202.1200 (syz-executor1571) @ 0xffffd880134bd140, l_stat=7

*** Locks held:

* Lock 0 (initialized at fstrans_init)

lock address : 0xffffffff862dad00 type : sleep/adaptive
initialized : 0xffffffff8516ded3

shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 0 last held: 0

relevant lwp : 0xffffd880134bd140 last held: 0xffffd880134bd140
last locked* : 0xffffffff851764d3 unlocked : 0xffffffff85129d3e
owner field : 0xffffd880134bd140 wait/spin: 0/0

Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 1201.1201 (syz-executor1571) @ 0xffffd880133670c0, l_stat=2

*** Locks held:

* Lock 0 (initialized at pmap_ctor)
lock address : 0xffffd88012bc28c0 type : sleep/adaptive
initialized : 0xffffffff818188e0

shared holds : 0 exclusive: 1
shares wanted: 0 exclusive: 0
relevant cpu : 1 last held: 1

relevant lwp : 0xffffd880133670c0 last held: 0xffffd880133670c0
last locked* : 0xffffffff81833a8b unlocked : 0xffffffff81826305

owner field : 000000000000000000 wait/spin: 0/0
Turnstile: no active turnstile for this lock.

*** Locks wanted: none

****** LWP 596.596 (dhcpcd) @ 0xffffd880123aa280, l_stat=3