panic: UBSan: Undefined Behavior in /syzkaller/managers/netbsd-kubsan/kernel/sys/net/rtsock_shared.c:LINE:[ [ 5599.6.A

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 6bce80fe Add sun6ispi
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=139e01cee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=824b23e1f4b6c76b
dashboard link: https://syzkaller.appspot.com/bug?extid=463bba65dd1dabb07ee6

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+463bba...@syzkaller.appspotmail.com

[ 59.5961995] panic: UBSan: Undefined Behavior in
/syzkaller/managers/netbsd-kubsan/kernel/sys/net/rtsock_shared.c:631:[ [
5599.6.067078861614]4] 4 1WA, RNmIemNGbe:r SPacL ceNsOsT LwiOtWhEiRnE D
mOisN aTlRiAgPn eEdXI aTd 6d re0[
59.6078614] ss 0xfffffd9cb98d548c for type 'struct rt_msghdr50' which
requires 8 byte alignment

[ 59.6078614] cpu0: Begin traceback...
[ 59.6078614] vpanic() at netbsd:vpanic+0x2aa sys/kern/subr_prf.c:336
[ 59.6078614] isAlreadyReported() at netbsd:isAlreadyReported
[ 59.6078614] HandleTypeMismatch.part.1() at
netbsd:HandleTypeMismatch.part.1+0xcc
[ 59.6078614] HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x7b
sys/../common/lib/libc/misc/ubsan.c:408
[ 59.6078614] compat_50_route_output() at
netbsd:compat_50_route_output+0x1a4a sys/net/rtsock_shared.c:631
[ 59.6078614] raw_send() at netbsd:raw_send+0x20b sys/net/raw_usrreq.c:182
[ 59.6078614] compat_50_route_send_wrapper() at
netbsd:compat_50_route_send_wrapper+0x9f compat_50_route_send
sys/net/rtsock_shared.c:464 [inline]
[ 59.6078614] compat_50_route_send_wrapper() at
netbsd:compat_50_route_send_wrapper+0x9f sys/net/rtsock_shared.c:1663
[ 59.6078614] sosend() at netbsd:sosend+0x15ab sys/kern/uipc_socket.c:1059
[ 59.6078614] do_sys_sendmsg_so() at netbsd:do_sys_sendmsg_so+0x53d
sys/kern/uipc_syscalls.c:629
[ 59.6078614] do_sys_sendmsg() at netbsd:do_sys_sendmsg+0xcd
sys/kern/uipc_syscalls.c:679
[ 59.6078614] sys_sendto() at netbsd:sys_sendto+0xc9
sys/kern/uipc_syscalls.c:514
[ 59.6078614] sys___syscall() at netbsd:sys___syscall+0x1c8 sy_call
sys/sys/syscallvar.h:65 [inline]
[ 59.6078614] sys___syscall() at netbsd:sys___syscall+0x1c8
sys/kern/sys_syscall.c:77
[ 59.6078614] syscall() at netbsd:syscall+0x29a sy_call
sys/sys/syscallvar.h:65 [inline]
[ 59.6078614] syscall() at netbsd:syscall+0x29a sy_invoke
sys/sys/syscallvar.h:94 [inline]
[ 59.6078614] syscall() at netbsd:syscall+0x29a
sys/arch/x86/x86/syscall.c:138
[ 59.6078614] --- syscall (number 198) ---
[ 59.6078614] Skipping crash dump on recursive panic
[ 59.6078614] panic: UBSan: Undefined Behavior in
/syzkaller/managers/netbsd-kubsan/kernel/sys/arch/amd64/amd64/db_machdep.c:153:24,
member access within misaligned address 0x6 for type 'struct x86_64_frame'
which requires 8 byte alignment

[ 59.6078614] Faulted in mid-traceback; aborting...
[ 59.6078614] fatal breakpoint trap in supervisor mode
[ 59.6078614] trap type 1 code 0 rip 0xffffffff8021ddfd cs 0x8 rflags
0x282 cr2 0x7b2be9e63000 ilevel 0x8 rsp 0xffff9500b3a735f0
[ 59.6078614] curlwp 0xfffffd9d9da1c9c0 pid 77.3 lowest kstack
0xffff9500b3a712c0
Stopped in pid 77.3 (syz-executor.5) at netbsd:breakpoint+0x5: leave
?
breakpoint() at netbsd:breakpoint+0x5
db_panic() at netbsd:db_panic+0x109 sys/ddb/db_panic.c:67
vpanic() at netbsd:vpanic+0x2aa sys/kern/subr_prf.c:336
isAlreadyReported() at netbsd:isAlreadyReported
HandleTypeMismatch.part.1() at netbsd:HandleTypeMismatch.part.1+0xcc
HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x7b
sys/../common/lib/libc/misc/ubsan.c:408
db_nextframe() at netbsd:db_nextframe+0x6f6
sys/arch/amd64/amd64/db_machdep.c:153
db_stack_trace_print() at netbsd:db_stack_trace_print+0x2c4
sys/arch/x86/x86/db_trace.c:277
db_panic() at netbsd:db_panic+0xa3 x86_curcpu
sys/arch/amd64/compile/obj/GENERIC_SYZKALLER/./machine/cpu.h:67 [inline]
db_panic() at netbsd:db_panic+0xa3 sys/ddb/db_panic.c:57
vpanic() at netbsd:vpanic+0x2aa sys/kern/subr_prf.c:336
isAlreadyReported() at netbsd:isAlreadyReported
HandleTypeMismatch.part.1() at netbsd:HandleTypeMismatch.part.1+0xcc
HandleTypeMismatch() at netbsd:HandleTypeMismatch+0x7b
sys/../common/lib/libc/misc/ubsan.c:408
compat_50_route_output() at netbsd:compat_50_route_output+0x1a4a
sys/net/rtsock_shared.c:631
raw_send() at netbsd:raw_send+0x20b sys/net/raw_usrreq.c:182
compat_50_route_send_wrapper() at netbsd:compat_50_route_send_wrapper+0x9f
compat_50_route_send sys/net/rtsock_shared.c:464 [inline]
compat_50_route_send_wrapper() at netbsd:compat_50_route_send_wrapper+0x9f
sys/net/rtsock_shared.c:1663
sosend() at netbsd:sosend+0x15ab sys/kern/uipc_socket.c:1059
do_sys_sendmsg_so() at netbsd:do_sys_sendmsg_so+0x53d
sys/kern/uipc_syscalls.c:629
do_sys_sendmsg() at netbsd:do_sys_sendmsg+0xcd sys/kern/uipc_syscalls.c:679
sys_sendto() at netbsd:sys_sendto+0xc9 sys/kern/uipc_syscalls.c:514
sys___syscall() at netbsd:sys___syscall+0x1c8 sy_call
sys/sys/syscallvar.h:65 [inline]
sys___syscall() at netbsd:sys___syscall+0x1c8 sys/kern/sys_syscall.c:77
syscall() at netbsd:syscall+0x29a sy_call sys/sys/syscallvar.h:65 [inline]
syscall() at netbsd:syscall+0x29a sy_invoke sys/sys/syscallvar.h:94 [inline]
syscall() at netbsd:syscall+0x29a sys/arch/x86/x86/syscall.c:138
--- syscall (number 198) ---
[ 59.6078614] Skipping crash dump on recursive panic
[ 59.6078614] panic: UBSan: Undefined Behavior in
/syzkaller/managers/netbsd-kubsan/kernel/sys/arch/amd64/amd64/db_machdep.c:154:14,
member access within misaligned address 0x6 for type 'struct x86_64_frame'
which requires 8 byte alignment

[ 59.6078614] Faulted in mid-traceback; aborting...
[ 59.6078614] fatal breakpoint trap in supervisor mode
[ 59.6078614] trap type 1 code 0 rip 0xffffffff8021ddfd cs 0x8 rflags
0x282 cr2 0x7b2be9e63000 ilevel 0x8 rsp 0xffff9500b3a722f0
[ 59.6078614] curlwp 0xfffffd9d9da1c9c0 pid 77.3 lowest kstack
0xffff9500b3a712c0
Stopped in pid 77.3 (syz-executor.5) at netbsd:breakpoint+0x5: leave


---
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[Maxime Villard]

dup but garbage, close

#syz invalid