WARNING in free_task
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syzbot
Oct 15, 2018, 3:53:03 AM10/15/18
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 774ea0551a29 Add linux-next specific files for 20181012
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=142e3b5e400000
kernel config: https://syzkaller.appspot.com/x/.config?x=273e86a7f336b114
dashboard link: https://syzkaller.appspot.com/bug?extid=3448dff2f422b1a50880
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [ak...@linux-foundation.org ebie...@xmission.com
gu...@fb.com kees...@chromium.org kirill....@linux.intel.com
linux-...@vger.kernel.org lu...@amacapital.net marcos.s...@gmail.com
mho...@kernel.org ri...@surriel.com w...@chromium.org]
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3448df...@syzkaller.appspotmail.com
WARNING: CPU: 0 PID: 14915 at kernel/fork.c:449 free_task+0x1b3/0x1f0
kernel/fork.c:449
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 14915 Comm: syz-executor0 Not tainted 4.19.0-rc7-next-20181012+
#93
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x3ab lib/dump_stack.c:113
panic+0x238/0x4e7 kernel/panic.c:184
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
report_bug+0x254/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:free_task+0x1b3/0x1f0 kernel/fork.c:449
kobject: 'loop2' (00000000a066beb8): kobject_uevent_env
Code: 25 28 00 00 00 75 4e 48 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8
8c 59 37 00 48 89 df e8 64 a2 0b 00 eb ac e8 7d 59 37 00 <0f> 0b e9 3f ff
ff ff e8 81 e0 7b 00 e9 7c ff ff ff 4c 89 e7 e8 14
RSP: 0018:ffff8801dae07498 EFLAGS: 00010206
RAX: ffff88017dc54240 RBX: ffff8801cd32e200 RCX: ffffffff81471010
RDX: 0000000000000100 RSI: ffffffff814710d3 RDI: 0000000000000005
RBP: ffff8801dae07520 R08: ffff88017dc54240 R09: ffffed0039a65ea7
R10: ffffed0039a65ea7 R11: ffff8801cd32f53b R12: 1ffff1003b5c0e97
R13: 1ffff1003b5c0e93 R14: 0000000000000001 R15: ffff8801dae074f8
kobject: 'loop2' (00000000a066beb8): fill_kobj_path: path
= '/devices/virtual/block/loop2'
__put_task_struct+0x2e6/0x620 kernel/fork.c:730
put_task_struct include/linux/sched/task.h:96 [inline]
delayed_put_task_struct+0x2fa/0x4b0 kernel/exit.c:181
__rcu_reclaim kernel/rcu/rcu.h:240 [inline]
rcu_do_batch kernel/rcu/tree.c:2437 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2716 [inline]
rcu_process_callbacks+0x1006/0x1ac0 kernel/rcu/tree.c:2697
__do_softirq+0x30d/0xb26 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x17f/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1cb/0x750 arch/x86/kernel/apic/apic.c:1061
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
</IRQ>
RIP: 0010:compound_head include/linux/page-flags.h:143 [inline]
RIP: 0010:PageSwapBacked include/linux/page-flags.h:307 [inline]
RIP: 0010:PageSwapCache include/linux/page-flags.h:352 [inline]
RIP: 0010:free_swap_cache mm/swap_state.c:266 [inline]
RIP: 0010:free_pages_and_swap_cache+0x115/0x6f0 mm/swap_state.c:294
Code: 89 85 60 fe ff ff 48 8d 85 d8 fe ff ff 48 c1 e8 03 48 01 d8 48 89 85
70 fe ff ff 48 8d 45 98 48 c1 e8 03 48 89 85 68 fe ff ff <e8> 76 a3 c3 ff
48 8b 85 60 fe ff ff 48 c1 e8 03 80 3c 18 00 0f 85
RSP: 0018:ffff88017c516a78 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81baca0d
RDX: 0000000000000022 RSI: 00000000000001fe RDI: 0000000000000004
RBP: ffff88017c516c48 R08: ffff88017dc54240 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0007014c00
R13: 00000000000001fe R14: 0000000000000022 R15: ffff88017c516c20
tlb_flush_mmu_free+0xff/0x1b0 mm/mmu_gather.c:74
zap_pte_range mm/memory.c:1158 [inline]
zap_pmd_range mm/memory.c:1193 [inline]
zap_pud_range mm/memory.c:1222 [inline]
zap_p4d_range mm/memory.c:1243 [inline]
unmap_page_range+0x1fa6/0x2870 mm/memory.c:1264
unmap_single_vma+0x19b/0x310 mm/memory.c:1309
unmap_vmas+0x125/0x200 mm/memory.c:1339
exit_mmap+0x2be/0x590 mm/mmap.c:3142
__mmput kernel/fork.c:1045 [inline]
mmput+0x247/0x610 kernel/fork.c:1066
exit_mm kernel/exit.c:545 [inline]
do_exit+0xe6f/0x2610 kernel/exit.c:854
do_group_exit+0x177/0x440 kernel/exit.c:970
get_signal+0x8a8/0x1970 kernel/signal.c:2517
do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbd16db8cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bfa8 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bfa8
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bfac
R13: 00007fff2a985d6f R14: 00007fbd16db99c0 R15: 0000000000000001
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug 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 bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
syzbot found the following crash on:
HEAD commit: 774ea0551a29 Add linux-next specific files for 20181012
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=142e3b5e400000
kernel config: https://syzkaller.appspot.com/x/.config?x=273e86a7f336b114
dashboard link: https://syzkaller.appspot.com/bug?extid=3448dff2f422b1a50880
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
CC: [ak...@linux-foundation.org ebie...@xmission.com
gu...@fb.com kees...@chromium.org kirill....@linux.intel.com
linux-...@vger.kernel.org lu...@amacapital.net marcos.s...@gmail.com
mho...@kernel.org ri...@surriel.com w...@chromium.org]
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3448df...@syzkaller.appspotmail.com
WARNING: CPU: 0 PID: 14915 at kernel/fork.c:449 free_task+0x1b3/0x1f0
kernel/fork.c:449
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 14915 Comm: syz-executor0 Not tainted 4.19.0-rc7-next-20181012+
#93
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x3ab lib/dump_stack.c:113
panic+0x238/0x4e7 kernel/panic.c:184
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
report_bug+0x254/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:free_task+0x1b3/0x1f0 kernel/fork.c:449
kobject: 'loop2' (00000000a066beb8): kobject_uevent_env
Code: 25 28 00 00 00 75 4e 48 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8
8c 59 37 00 48 89 df e8 64 a2 0b 00 eb ac e8 7d 59 37 00 <0f> 0b e9 3f ff
ff ff e8 81 e0 7b 00 e9 7c ff ff ff 4c 89 e7 e8 14
RSP: 0018:ffff8801dae07498 EFLAGS: 00010206
RAX: ffff88017dc54240 RBX: ffff8801cd32e200 RCX: ffffffff81471010
RDX: 0000000000000100 RSI: ffffffff814710d3 RDI: 0000000000000005
RBP: ffff8801dae07520 R08: ffff88017dc54240 R09: ffffed0039a65ea7
R10: ffffed0039a65ea7 R11: ffff8801cd32f53b R12: 1ffff1003b5c0e97
R13: 1ffff1003b5c0e93 R14: 0000000000000001 R15: ffff8801dae074f8
kobject: 'loop2' (00000000a066beb8): fill_kobj_path: path
= '/devices/virtual/block/loop2'
__put_task_struct+0x2e6/0x620 kernel/fork.c:730
put_task_struct include/linux/sched/task.h:96 [inline]
delayed_put_task_struct+0x2fa/0x4b0 kernel/exit.c:181
__rcu_reclaim kernel/rcu/rcu.h:240 [inline]
rcu_do_batch kernel/rcu/tree.c:2437 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2716 [inline]
rcu_process_callbacks+0x1006/0x1ac0 kernel/rcu/tree.c:2697
__do_softirq+0x30d/0xb26 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x17f/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1cb/0x750 arch/x86/kernel/apic/apic.c:1061
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
</IRQ>
RIP: 0010:compound_head include/linux/page-flags.h:143 [inline]
RIP: 0010:PageSwapBacked include/linux/page-flags.h:307 [inline]
RIP: 0010:PageSwapCache include/linux/page-flags.h:352 [inline]
RIP: 0010:free_swap_cache mm/swap_state.c:266 [inline]
RIP: 0010:free_pages_and_swap_cache+0x115/0x6f0 mm/swap_state.c:294
Code: 89 85 60 fe ff ff 48 8d 85 d8 fe ff ff 48 c1 e8 03 48 01 d8 48 89 85
70 fe ff ff 48 8d 45 98 48 c1 e8 03 48 89 85 68 fe ff ff <e8> 76 a3 c3 ff
48 8b 85 60 fe ff ff 48 c1 e8 03 80 3c 18 00 0f 85
RSP: 0018:ffff88017c516a78 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81baca0d
RDX: 0000000000000022 RSI: 00000000000001fe RDI: 0000000000000004
RBP: ffff88017c516c48 R08: ffff88017dc54240 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0007014c00
R13: 00000000000001fe R14: 0000000000000022 R15: ffff88017c516c20
tlb_flush_mmu_free+0xff/0x1b0 mm/mmu_gather.c:74
zap_pte_range mm/memory.c:1158 [inline]
zap_pmd_range mm/memory.c:1193 [inline]
zap_pud_range mm/memory.c:1222 [inline]
zap_p4d_range mm/memory.c:1243 [inline]
unmap_page_range+0x1fa6/0x2870 mm/memory.c:1264
unmap_single_vma+0x19b/0x310 mm/memory.c:1309
unmap_vmas+0x125/0x200 mm/memory.c:1339
exit_mmap+0x2be/0x590 mm/mmap.c:3142
__mmput kernel/fork.c:1045 [inline]
mmput+0x247/0x610 kernel/fork.c:1066
exit_mm kernel/exit.c:545 [inline]
do_exit+0xe6f/0x2610 kernel/exit.c:854
do_group_exit+0x177/0x440 kernel/exit.c:970
get_signal+0x8a8/0x1970 kernel/signal.c:2517
do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbd16db8cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bfa8 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bfa8
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bfac
R13: 00007fff2a985d6f R14: 00007fbd16db99c0 R15: 0000000000000001
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug 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 bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
Dmitry Vyukov
Oct 15, 2018, 3:54:42 AM10/15/18
to syzbot, 'Dmitry Vyukov' via syzkaller-upstream-moderation
Right before crash the following program was executed:
23:17:20 executing program 4:
accept4$alg(0xffffffffffffffff, 0x0, 0x0, 0x0)
r0 = openat$rdma_cm(0xffffffffffffff9c,
&(0x7f0000000380)='/dev/infiniband/rdma_cm\x00', 0x2, 0x0)
write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000280)={0x0, 0x18,
0xfa00, {0x0, &(0x7f0000000080)={<r1=>0xffffffffffffffff},
0x40000000013f}}, 0x20)
write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f00000001c0)={0x3, 0x40,
0xfa00, {{0xa, 0x4e23, 0x0, @loopback}, {0xa, 0x0, 0x0, @dev}, r1}},
0x48)
write$RDMA_USER_CM_CMD_DESTROY_ID(0xffffffffffffffff,
&(0x7f0000000180)={0x1, 0x10, 0xfa00, {&(0x7f0000000040)}}, 0x18)
r2 = syz_open_dev$amidi(&(0x7f0000001640)='/dev/amidi#\x00', 0x86f, 0x10080)
getsockopt$inet_sctp_SCTP_GET_LOCAL_ADDRS(0xffffffffffffffff, 0x84,
0x6d, &(0x7f0000001680)={<r3=>0x0, 0x9e,
"8b99b1c58019d71340087470d80235e2b1fc252edada6c917f85b2f1ad53ee6b9d4a3bd9982a0e51da9d14f1996bfbfaf3c544aec29bed8f7a59555186f76efbc3a4e320140e7c446f958cbea6593b2ad0a10d8033758ebc5072e43bc2c84fc42c4b3fc782888b47b5386d9716311367727e505693f00988416ba474b8372320eaa331eba9a5a11c738b79626ee17204eb53113309459364f207cea0857e"},
&(0x7f0000001740)=0xa6)
setsockopt$inet_sctp_SCTP_AUTH_DEACTIVATE_KEY(r2, 0x84, 0x23,
&(0x7f0000001780)={r3, 0x2}, 0x8)
r4 = syz_open_dev$adsp(&(0x7f0000000000)='/dev/adsp#\x00', 0xccee, 0x4000)
ioctl$BLKDISCARD(r4, 0x1277, &(0x7f00000000c0)=0xc19)
#syz dup: WARNING in __put_task_struct (2)
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> For more options, visit https://groups.google.com/d/optout.
23:17:20 executing program 4:
accept4$alg(0xffffffffffffffff, 0x0, 0x0, 0x0)
r0 = openat$rdma_cm(0xffffffffffffff9c,
&(0x7f0000000380)='/dev/infiniband/rdma_cm\x00', 0x2, 0x0)
write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000280)={0x0, 0x18,
0xfa00, {0x0, &(0x7f0000000080)={<r1=>0xffffffffffffffff},
0x40000000013f}}, 0x20)
write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f00000001c0)={0x3, 0x40,
0xfa00, {{0xa, 0x4e23, 0x0, @loopback}, {0xa, 0x0, 0x0, @dev}, r1}},
0x48)
write$RDMA_USER_CM_CMD_DESTROY_ID(0xffffffffffffffff,
&(0x7f0000000180)={0x1, 0x10, 0xfa00, {&(0x7f0000000040)}}, 0x18)
r2 = syz_open_dev$amidi(&(0x7f0000001640)='/dev/amidi#\x00', 0x86f, 0x10080)
getsockopt$inet_sctp_SCTP_GET_LOCAL_ADDRS(0xffffffffffffffff, 0x84,
0x6d, &(0x7f0000001680)={<r3=>0x0, 0x9e,
"8b99b1c58019d71340087470d80235e2b1fc252edada6c917f85b2f1ad53ee6b9d4a3bd9982a0e51da9d14f1996bfbfaf3c544aec29bed8f7a59555186f76efbc3a4e320140e7c446f958cbea6593b2ad0a10d8033758ebc5072e43bc2c84fc42c4b3fc782888b47b5386d9716311367727e505693f00988416ba474b8372320eaa331eba9a5a11c738b79626ee17204eb53113309459364f207cea0857e"},
&(0x7f0000001740)=0xa6)
setsockopt$inet_sctp_SCTP_AUTH_DEACTIVATE_KEY(r2, 0x84, 0x23,
&(0x7f0000001780)={r3, 0x2}, 0x8)
r4 = syz_open_dev$adsp(&(0x7f0000000000)='/dev/adsp#\x00', 0xccee, 0x4000)
ioctl$BLKDISCARD(r4, 0x1277, &(0x7f00000000c0)=0xc19)
#syz dup: WARNING in __put_task_struct (2)
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