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KMSAN: uninit-value in kallsyms_lookup

Status: closed as invalid on 2018/06/27 15:18
Subsystems: kernel
[Documentation on labels]
First crash: 2196d, last: 2176d
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in kallsyms_lookup (2) kernel 23 1445d 1467d 0/26 closed as invalid on 2020/05/14 13:06
upstream KMSAN: uninit-value in kallsyms_lookup (4) kernel 2 1086d 1190d 0/26 auto-closed as invalid on 2021/08/03 21:49
upstream KMSAN: uninit-value in kallsyms_lookup (3) kernel 16 1302d 1408d 0/26 auto-closed as invalid on 2021/01/01 15:28

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in is_kernel include/linux/kallsyms.h:41 [inline]
BUG: KMSAN: uninit-value in is_ksym_addr include/linux/kallsyms.h:49 [inline]
BUG: KMSAN: uninit-value in kallsyms_lookup+0x152/0x910 kernel/kallsyms.c:288
CPU: 0 PID: 4505 Comm: syz-executor288 Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 is_kernel include/linux/kallsyms.h:41 [inline]
 is_ksym_addr include/linux/kallsyms.h:49 [inline]
 kallsyms_lookup+0x152/0x910 kernel/kallsyms.c:288
 __sprint_symbol+0x147/0x5b0 kernel/kallsyms.c:361
 sprint_backtrace+0x7f/0x90 kernel/kallsyms.c:429
 symbol_string+0x19f/0x230 lib/vsprintf.c:684
 pointer+0xdb9/0x1410 lib/vsprintf.c:1870
 vsnprintf+0xa2d/0x33c0 lib/vsprintf.c:2286
 seq_vprintf fs/seq_file.c:400 [inline]
 seq_printf+0x29f/0x420 fs/seq_file.c:415
 proc_pid_stack+0x326/0x470 fs/proc/base.c:449
 proc_single_show+0x1af/0x300 fs/proc/base.c:747
 seq_read+0xc7d/0x2260 fs/seq_file.c:237
 do_loop_readv_writev fs/read_write.c:673 [inline]
 do_iter_read+0x880/0xd70 fs/read_write.c:897
 vfs_readv fs/read_write.c:959 [inline]
 do_readv+0x295/0x5f0 fs/read_write.c:992
 SYSC_readv+0x9b/0xb0 fs/read_write.c:1079
 SyS_readv+0x56/0x80 fs/read_write.c:1076
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x445589
RSP: 002b:00007fc1941dfd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445589
RDX: 0000000000000001 RSI: 00000000200012c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f
R10: 65732f636f72702f R11: 0000000000000246 R12: 00007fc1941dfd20
R13: 00000000006dac20 R14: 0000000000000000 R15: 0000000000000002

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:528
 save_stack_address arch/x86/kernel/stacktrace.c:29 [inline]
 __save_stack_trace+0x829/0xb00 arch/x86/kernel/stacktrace.c:50
 save_stack_trace_tsk+0x258/0x2f0 arch/x86/kernel/stacktrace.c:82
 proc_pid_stack+0x26a/0x470 fs/proc/base.c:446
 proc_single_show+0x1af/0x300 fs/proc/base.c:747
 seq_read+0xc7d/0x2260 fs/seq_file.c:237
 do_loop_readv_writev fs/read_write.c:673 [inline]
 do_iter_read+0x880/0xd70 fs/read_write.c:897
 vfs_readv fs/read_write.c:959 [inline]
 do_readv+0x295/0x5f0 fs/read_write.c:992
 SYSC_readv+0x9b/0xb0 fs/read_write.c:1079
 SyS_readv+0x56/0x80 fs/read_write.c:1076
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:528
 update_stack_state+0x959/0xa40 arch/x86/kernel/unwind_frame.c:257
 unwind_next_frame+0x618/0xe50 arch/x86/kernel/unwind_frame.c:329
 __save_stack_trace+0x734/0xb00 arch/x86/kernel/stacktrace.c:48
 save_stack_trace_tsk+0x258/0x2f0 arch/x86/kernel/stacktrace.c:82
 proc_pid_stack+0x26a/0x470 fs/proc/base.c:446
 proc_single_show+0x1af/0x300 fs/proc/base.c:747
 seq_read+0xc7d/0x2260 fs/seq_file.c:237
 do_loop_readv_writev fs/read_write.c:673 [inline]
 do_iter_read+0x880/0xd70 fs/read_write.c:897
 vfs_readv fs/read_write.c:959 [inline]
 do_readv+0x295/0x5f0 fs/read_write.c:992
 SYSC_readv+0x9b/0xb0 fs/read_write.c:1079
 SyS_readv+0x56/0x80 fs/read_write.c:1076
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Local variable description: ----ewq@userfaultfd_unmap_complete
Variable was created at:
 userfaultfd_unmap_complete+0x49/0x4e0 fs/userfaultfd.c:828
 vm_munmap mm/mmap.c:2747 [inline]
 SYSC_munmap+0x1c5/0x1f0 mm/mmap.c:2755
==================================================================

Crashes (69):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/04 03:03 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report syz C ci-upstream-kmsan-gce
2018/05/12 11:06 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/11 22:29 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 12:53 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 07:34 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 06:04 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 10:40 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/08 17:57 https://github.com/google/kmsan.git master d2d741e5d189 b88872ba .config console log report ci-upstream-kmsan-gce
2018/05/08 10:37 https://github.com/google/kmsan.git master d2d741e5d189 045bbd4a .config console log report ci-upstream-kmsan-gce
2018/05/08 03:36 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/08 02:28 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/07 22:45 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/07 12:37 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/07 05:05 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/07 01:55 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/06 18:06 https://github.com/google/kmsan.git master d2d741e5d189 6c18ddb0 .config console log report ci-upstream-kmsan-gce
2018/05/06 15:26 https://github.com/google/kmsan.git master d2d741e5d189 6c18ddb0 .config console log report ci-upstream-kmsan-gce
2018/05/06 09:06 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/06 02:36 https://github.com/google/kmsan.git master d2d741e5d189 78b251cb .config console log report ci-upstream-kmsan-gce
2018/05/05 09:16 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/05 02:09 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/04 12:36 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/04 11:26 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/04 01:18 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report ci-upstream-kmsan-gce
2018/05/02 14:39 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/02 01:59 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 22:01 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 20:40 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 19:38 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 16:12 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 11:25 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 08:06 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 06:32 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/05/01 00:08 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report ci-upstream-kmsan-gce
2018/04/30 17:27 https://github.com/google/kmsan.git master d2d741e5d189 06db3cec .config console log report ci-upstream-kmsan-gce
2018/04/30 16:08 https://github.com/google/kmsan.git master d2d741e5d189 06db3cec .config console log report ci-upstream-kmsan-gce
2018/04/30 09:26 https://github.com/google/kmsan.git master d2d741e5d189 06db3cec .config console log report ci-upstream-kmsan-gce
2018/04/30 07:07 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report ci-upstream-kmsan-gce
2018/04/30 01:18 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report ci-upstream-kmsan-gce
2018/04/29 22:24 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report ci-upstream-kmsan-gce
2018/04/29 20:22 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report ci-upstream-kmsan-gce
2018/04/29 20:14 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report ci-upstream-kmsan-gce
2018/04/29 12:35 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/29 08:03 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/29 07:47 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/28 11:50 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report ci-upstream-kmsan-gce
2018/04/27 21:27 https://github.com/google/kmsan.git master d2d741e5d189 7785e404 .config console log report ci-upstream-kmsan-gce
2018/04/27 15:27 https://github.com/google/kmsan.git master d2d741e5d189 7785e404 .config console log report ci-upstream-kmsan-gce
2018/04/21 16:16 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.