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pkg/report: trim panic_on_warn set few lines earlier

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The KCSAN reports can be quite short.
Now with task contexts we can hopefully reduce the threshold a bit.
This commit is contained in:
Dmitry Vyukov 2019-11-08 07:50:44 +01:00
parent f39aff9e4a
commit 1e35461e02
2 changed files with 82 additions and 1 deletions
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2
pkg/report/linux.go
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@ -251,7 +251,7 @@ func (ctx *linux) findReport(output []byte, oops *oops, startPos int, context st
// from other CPUs regardless of what is the current context.
// Otherwise we will throw traceback away because it does not match the oops context.
cpuTraceback = true
} else if textLines > 25 &&
} else if textLines > 22 &&
(bytes.Contains(line, []byte("Kernel panic - not syncing")) ||
bytes.Contains(line, []byte("WARNING: possible circular locking dependency detected"))) {
// If panic_on_warn set, then we frequently have 2 stacks:

81
pkg/report/testdata/linux/report/449 vendored Normal file
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@ -0,0 +1,81 @@
TITLE: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg
TYPE: DATARACE
[ 472.478762][T19789] ==================================================================
[ 472.486894][T19789] BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg
[ 472.494249][T19789]
[ 472.496603][T19789] write to 0xffff8880b588efb2 of 2 bytes by task 19788 on cpu 0:
[ 472.504348][T19789] netlink_recvmsg+0x196/0x910
[ 472.509121][T19789] sock_recvmsg_nosec+0x5c/0x70
[ 472.513990][T19789] ___sys_recvmsg+0x1a0/0x3e0
[ 472.518791][T19789] do_recvmmsg+0x19a/0x5c0
[ 472.523196][T19789] __sys_recvmmsg+0x1ef/0x200
[ 472.527980][T19789] __x64_sys_recvmmsg+0x89/0xb0
[ 472.532862][T19789] do_syscall_64+0xcc/0x370
[ 472.537395][T19789] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 472.543289][T19789]
[ 472.545632][T19789] write to 0xffff8880b588efb2 of 2 bytes by task 19789 on cpu 1:
[ 472.553375][T19789] netlink_recvmsg+0x196/0x910
[ 472.558178][T19789] sock_recvmsg+0x92/0xb0
[ 472.562518][T19789] __sys_recvfrom+0x1ae/0x2d0
[ 472.567200][T19789] __x64_sys_recvfrom+0x89/0xb0
[ 472.572077][T19789] do_syscall_64+0xcc/0x370
[ 472.576596][T19789] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 472.582493][T19789]
[ 472.584823][T19789] Reported by Kernel Concurrency Sanitizer on:
[ 472.591100][T19789] CPU: 1 PID: 19789 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0
[ 472.599001][T19789] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 472.609194][T19789] ==================================================================
[ 472.617280][T19789] Kernel panic - not syncing: panic_on_warn set ...
[ 472.623912][T19789] CPU: 1 PID: 19789 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0
[ 472.631819][T19789] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 472.641880][T19789] Call Trace:
[ 472.645181][T19789] dump_stack+0xf5/0x159
[ 472.649446][T19789] panic+0x210/0x640
[ 472.654132][T19789] ? vprintk_func+0x8d/0x140
[ 472.658728][T19789] kcsan_report.cold+0xc/0xe
[ 472.663325][T19789] kcsan_setup_watchpoint+0x3fe/0x410
[ 472.668711][T19789] __tsan_unaligned_write2+0x143/0x1f0
[ 472.674172][T19789] netlink_recvmsg+0x196/0x910
[ 472.694611][T19789] sock_recvmsg+0x92/0xb0
[ 472.698945][T19789] __sys_recvfrom+0x1ae/0x2d0
[ 472.730069][T19789] __x64_sys_recvfrom+0x89/0xb0
[ 472.735015][T19789] do_syscall_64+0xcc/0x370
[ 472.739525][T19789] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 472.745411][T19789] RIP: 0033:0x45a219
[ 472.749313][T19789] Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
[ 472.768910][T19789] RSP: 002b:00007f580a978c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
[ 472.777579][T19789] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045a219
[ 472.785564][T19789] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
[ 472.794320][T19789] RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
[ 472.802300][T19789] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f580a9796d4
[ 472.810544][T19789] R13: 00000000004c7c59 R14: 00000000004ddd80 R15: 00000000ffffffff
[ 472.819997][T19789] Kernel Offset: disabled
[ 472.824338][T19789] Rebooting in 86400 seconds..
REPORT:
==================================================================
BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg
write to 0xffff8880b588efb2 of 2 bytes by task 19788 on cpu 0:
netlink_recvmsg+0x196/0x910
sock_recvmsg_nosec+0x5c/0x70
___sys_recvmsg+0x1a0/0x3e0
do_recvmmsg+0x19a/0x5c0
__sys_recvmmsg+0x1ef/0x200
__x64_sys_recvmmsg+0x89/0xb0
do_syscall_64+0xcc/0x370
entry_SYSCALL_64_after_hwframe+0x44/0xa9
write to 0xffff8880b588efb2 of 2 bytes by task 19789 on cpu 1:
netlink_recvmsg+0x196/0x910
sock_recvmsg+0x92/0xb0
__sys_recvfrom+0x1ae/0x2d0
__x64_sys_recvfrom+0x89/0xb0
do_syscall_64+0xcc/0x370
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19789 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================