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KMSAN: uninit-value in pointer

Status: closed as invalid on 2018/06/27 15:18
Subsystems: fs
[Documentation on labels]
First crash: 2660d, last: 2638d

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KMSAN: uninit-value in pointer+0x11e5/0x1410 lib/vsprintf.c:1862
CPU: 0 PID: 4525 Comm: syz-executor552 Not tainted 4.17.0-rc3+ #88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 pointer+0x11e5/0x1410 lib/vsprintf.c:1862
 vsnprintf+0xa2d/0x33c0 lib/vsprintf.c:2296
 seq_vprintf fs/seq_file.c:403 [inline]
 seq_printf+0x29f/0x420 fs/seq_file.c:418
 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:240
 __vfs_read+0x1a5/0x9b0 fs/read_write.c:416
 vfs_read+0x36c/0x6c0 fs/read_write.c:452
 ksys_pread64 fs/read_write.c:626 [inline]
 __do_sys_pread64 fs/read_write.c:636 [inline]
 __se_sys_pread64 fs/read_write.c:633 [inline]
 __x64_sys_pread64+0x2f2/0x390 fs/read_write.c:633
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x445569
RSP: 002b:00007f2fcc42cd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445569
RDX: 00000000ffffff72 RSI: 0000000020003c00 RDI: 0000000000000003
RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2fcc42cd20
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:240
 __vfs_read+0x1a5/0x9b0 fs/read_write.c:416
 vfs_read+0x36c/0x6c0 fs/read_write.c:452
 ksys_pread64 fs/read_write.c:626 [inline]
 __do_sys_pread64 fs/read_write.c:636 [inline]
 __se_sys_pread64 fs/read_write.c:633 [inline]
 __x64_sys_pread64+0x2f2/0x390 fs/read_write.c:633
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
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:240
 __vfs_read+0x1a5/0x9b0 fs/read_write.c:416
 vfs_read+0x36c/0x6c0 fs/read_write.c:452
 ksys_pread64 fs/read_write.c:626 [inline]
 __do_sys_pread64 fs/read_write.c:636 [inline]
 __se_sys_pread64 fs/read_write.c:633 [inline]
 __x64_sys_pread64+0x2f2/0x390 fs/read_write.c:633
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Local variable description: ----mmap_event@perf_event_mmap
Variable was created at:
 perf_event_mmap+0xa5/0x1ec0 kernel/events/core.c:7409
 mmap_region+0x1a98/0x3730 mm/mmap.c:1763
==================================================================

Crashes (318):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/11 02:07 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report syz C ci-upstream-kmsan-gce
2018/05/04 02:48 https://github.com/google/kmsan.git master d2d741e5d189 9ce14f4b .config console log report syz C ci-upstream-kmsan-gce
2018/05/02 15:10 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz C ci-upstream-kmsan-gce
2018/05/02 02:20 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz C ci-upstream-kmsan-gce
2018/05/01 21:03 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz C ci-upstream-kmsan-gce
2018/05/01 20:02 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz C ci-upstream-kmsan-gce
2018/05/01 16:39 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz C ci-upstream-kmsan-gce
2018/05/01 11:43 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz C ci-upstream-kmsan-gce
2018/05/01 06:58 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz C ci-upstream-kmsan-gce
2018/05/01 00:24 https://github.com/google/kmsan.git master d2d741e5d189 d5b114b4 .config console log report syz C ci-upstream-kmsan-gce
2018/04/30 18:19 https://github.com/google/kmsan.git master d2d741e5d189 06db3cec .config console log report syz C ci-upstream-kmsan-gce
2018/04/30 16:28 https://github.com/google/kmsan.git master d2d741e5d189 06db3cec .config console log report syz C ci-upstream-kmsan-gce
2018/04/30 09:43 https://github.com/google/kmsan.git master d2d741e5d189 06db3cec .config console log report syz C ci-upstream-kmsan-gce
2018/04/30 07:24 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report syz C ci-upstream-kmsan-gce
2018/04/30 01:35 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report syz C ci-upstream-kmsan-gce
2018/04/29 23:07 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report syz C ci-upstream-kmsan-gce
2018/04/29 20:58 https://github.com/google/kmsan.git master d2d741e5d189 bb79c6ab .config console log report syz C ci-upstream-kmsan-gce
2018/04/29 12:56 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report syz C ci-upstream-kmsan-gce
2018/04/29 09:07 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report syz C ci-upstream-kmsan-gce
2018/04/29 08:37 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report syz C ci-upstream-kmsan-gce
2018/04/28 12:04 https://github.com/google/kmsan.git master d2d741e5d189 d5a5d045 .config console log report syz C ci-upstream-kmsan-gce
2018/04/27 21:46 https://github.com/google/kmsan.git master d2d741e5d189 7785e404 .config console log report syz C ci-upstream-kmsan-gce
2018/04/27 15:50 https://github.com/google/kmsan.git master d2d741e5d189 7785e404 .config console log report syz C ci-upstream-kmsan-gce
2018/04/26 21:00 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/26 19:52 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/26 10:35 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/25 23:42 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/25 23:21 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/25 21:39 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/25 20:49 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/25 17:36 https://github.com/google/kmsan.git master d2d741e5d189 73417389 .config console log report syz C ci-upstream-kmsan-gce
2018/04/25 03:16 https://github.com/google/kmsan.git master d2d741e5d189 37e76fe2 .config console log report syz C ci-upstream-kmsan-gce
2018/04/24 06:11 https://github.com/google/kmsan.git master d2d741e5d189 e7e85d36 .config console log report syz C ci-upstream-kmsan-gce
2018/04/23 18:37 https://github.com/google/kmsan.git master d2d741e5d189 0d8e591c .config console log report syz C ci-upstream-kmsan-gce
2018/04/23 11:47 https://github.com/google/kmsan.git master d2d741e5d189 20941ab3 .config console log report syz C ci-upstream-kmsan-gce
2018/04/22 08:09 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report syz C ci-upstream-kmsan-gce
2018/04/22 07:50 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report syz C ci-upstream-kmsan-gce
2018/04/22 07:26 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report syz C ci-upstream-kmsan-gce
2018/04/21 16:40 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report syz C ci-upstream-kmsan-gce
2018/04/21 15:44 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report syz C ci-upstream-kmsan-gce
2018/05/13 08:40 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/13 03:27 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/13 02:15 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/13 00:32 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 20:50 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 19:14 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 17:39 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 13:42 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 10:00 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 05:53 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/12 02:34 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/12 00:29 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 22:27 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 21:22 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 16:38 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 13:04 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 12:00 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 07:58 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 05:29 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 04:23 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 01:33 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 23:32 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 19:25 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 14:15 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 12:02 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 09:05 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 19:22 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 14:45 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 13:32 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 11:44 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 09:21 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 06:14 https://github.com/google/kmsan.git master 74ee2200b89f b88872ba .config console log report ci-upstream-kmsan-gce
2018/05/09 05:00 https://github.com/google/kmsan.git master 74ee2200b89f b88872ba .config console log report ci-upstream-kmsan-gce
2018/05/09 03:59 https://github.com/google/kmsan.git master 74ee2200b89f b88872ba .config console log report ci-upstream-kmsan-gce
2018/05/09 02:02 https://github.com/google/kmsan.git master 74ee2200b89f b88872ba .config console log report ci-upstream-kmsan-gce
2018/05/08 21:01 https://github.com/google/kmsan.git master 74ee2200b89f b88872ba .config console log report ci-upstream-kmsan-gce
2018/05/08 17:28 https://github.com/google/kmsan.git master d2d741e5d189 b88872ba .config console log report ci-upstream-kmsan-gce
2018/05/08 13:25 https://github.com/google/kmsan.git master d2d741e5d189 045bbd4a .config console log report ci-upstream-kmsan-gce
2018/05/08 06:12 https://github.com/google/kmsan.git master d2d741e5d189 045bbd4a .config console log report ci-upstream-kmsan-gce
2018/05/08 01:34 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/08 00:29 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/07 23:17 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/07 21:41 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/07 20:12 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/07 17:49 https://github.com/google/kmsan.git master d2d741e5d189 9e0846e8 .config console log report ci-upstream-kmsan-gce
2018/05/07 12:36 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
2018/05/07 09:36 https://github.com/google/kmsan.git master d2d741e5d189 a211da1a .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.