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WARNING in __might_sleep (2)

Status: fixed on 2019/03/06 07:43
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+c244af085a0159d22879@syzkaller.appspotmail.com
Fix commit: fc01d8c61ce0 tty/n_hdlc: fix __might_sleep warning
First crash: 2397d, last: 2366d
▶ ▼ Discussions (9)
Title Replies (including bot) Last reply
[PATCH 3.16 000/202] 3.16.66-rc1 review 205 (205) 2019/04/28 15:45
[PATCH 4.4 00/65] 4.4.173-stable review 73 (73) 2019/02/05 15:12
[PATCH 3.18 00/31] 3.18.134-stable review 36 (36) 2019/02/05 14:41
[PATCH 4.14 00/68] 4.14.97-stable review 78 (78) 2019/02/04 10:35
[PATCH 4.19 000/103] 4.19.19-stable review 121 (121) 2019/02/01 20:12
[PATCH 4.9 00/44] 4.9.154-stable review 56 (56) 2019/01/31 10:15
[PATCH 4.20 000/117] 4.20.6-stable review 124 (124) 2019/01/31 07:52
[PATCH] tty/n_hdlc: fix sleep in !TASK_RUNNING state warning 5 (5) 2019/01/10 12:25
WARNING in __might_sleep (2) 0 (1) 2018/12/29 00:41
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __might_sleep (3) kernel -1 6 2267d 2276d 0/29 closed as invalid on 2019/05/08 12:35
android-49 WARNING in __might_sleep -1 syz 11 2398d 2287d 0/3 public: reported syz repro on 2019/04/14 09:28
upstream WARNING in __might_sleep kernel -1 6 2640d 2643d 5/29 fixed on 2018/05/08 18:30

Sample crash report:
------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=1 set at [<00000000b77d0bb9>] n_hdlc_tty_read+0x301/0x7f0 drivers/tty/n_hdlc.c:589
WARNING: CPU: 0 PID: 7931 at kernel/sched/core.c:6099 __might_sleep+0x13d/0x190 kernel/sched/core.c:6094
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 7931 Comm: syz-executor965 Not tainted 4.20.0+ #388
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+0x1d3/0x2c6 lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 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:973
RIP: 0010:__might_sleep+0x13d/0x190 kernel/sched/core.c:6094
Code: 65 48 8b 1c 25 40 ee 01 00 48 8d 7b 10 48 89 fe 48 c1 ee 03 80 3c 06 00 75 2b 48 8b 73 10 48 c7 c7 40 e0 2a 88 e8 43 27 f3 ff <0f> 0b e9 43 ff ff ff e8 f7 7e 6c 00 e9 26 ff ff ff e8 ed 7e 6c 00
RSP: 0018:ffff8881d9337948 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8881b8632240 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8164e075 RDI: 0000000000000005
RBP: ffff8881d9337978 R08: ffff8881b8632240 R09: 0000000000000007
R10: 0000000000000000 R11: ffff8881b8632240 R12: ffffffff8860b220
R13: 0000000000000019 R14: 0000000000000000 R15: ffff8881b8632240
 __might_fault+0xc6/0x1e0 mm/memory.c:4357
 _copy_to_user+0x30/0x110 lib/usercopy.c:25
 copy_to_user include/linux/uaccess.h:155 [inline]
 n_hdlc_tty_read+0x5c1/0x7f0 drivers/tty/n_hdlc.c:600
 tty_read+0x194/0x2a0 drivers/tty/tty_io.c:866
 __vfs_read+0x117/0x9b0 fs/read_write.c:416
 vfs_read+0x17f/0x3c0 fs/read_write.c:452
 ksys_read+0x101/0x260 fs/read_write.c:578
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read fs/read_write.c:586 [inline]
 __x64_sys_read+0x73/0xb0 fs/read_write.c:586
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440099
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd58610488 EFLAGS: 00000207 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099
RDX: 0000000000000057 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000207 R12: 0000000000401920
R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (36):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/12/26 09:17 upstream d8924c0d76aa 8a41a0ad .config console log report syz C ci-upstream-kasan-gce-root
2018/12/25 07:26 upstream 8fe28cb58bcb 8a41a0ad .config console log report syz C ci-upstream-kasan-gce-selinux-root
2018/12/25 02:39 upstream 8fe28cb58bcb 8a41a0ad .config console log report syz C ci-upstream-kasan-gce-smack-root
2018/12/25 01:10 upstream 8fe28cb58bcb 8a41a0ad .config console log report syz C ci-upstream-kasan-gce
2018/12/25 04:19 upstream 8fe28cb58bcb 8a41a0ad .config console log report syz C ci-upstream-kasan-gce-386
2018/12/28 05:15 linux-next 6a1d293238c1 af317504 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/01/25 08:33 upstream c04e2a780caf bfab9cd8 .config console log report ci-upstream-kasan-gce-selinux-root
2019/01/25 08:17 upstream c04e2a780caf bfab9cd8 .config console log report ci-upstream-kasan-gce
2019/01/24 08:03 upstream 30bac164aca7 56558f63 .config console log report ci-upstream-kasan-gce
2019/01/23 19:10 upstream 333478a7eb21 7cf3249c .config console log report ci-upstream-kasan-gce-selinux-root
2019/01/23 19:10 upstream 333478a7eb21 7cf3249c .config console log report ci-upstream-kasan-gce-selinux-root
2019/01/23 19:10 upstream 333478a7eb21 7cf3249c .config console log report ci-upstream-kasan-gce-smack-root
2019/01/22 14:04 upstream 48b161983ae5 985f75cc .config console log report ci-upstream-kasan-gce-smack-root
2019/01/21 14:31 upstream 49a57857aeea badbbeee .config console log report ci-upstream-kasan-gce-smack-root
2019/01/19 03:53 upstream d7393226d15a 2103a236 .config console log report ci-upstream-kasan-gce-smack-root
2019/01/19 03:51 upstream d7393226d15a 2103a236 .config console log report ci-upstream-kasan-gce-selinux-root
2019/01/19 03:35 upstream d7393226d15a 2103a236 .config console log report ci-upstream-kasan-gce-selinux-root
2019/01/19 03:30 upstream d7393226d15a 2103a236 .config console log report ci-upstream-kasan-gce
2019/01/10 21:41 upstream ba422731316d db9b6579 .config console log report ci-upstream-kasan-gce-root
2019/01/08 04:35 upstream 3bd6e94bec12 69d69aa9 .config console log report ci-upstream-kasan-gce-smack-root
2019/01/08 02:57 upstream 3bd6e94bec12 69d69aa9 .config console log report ci-upstream-kasan-gce-smack-root
2019/01/07 15:19 upstream 3bd6e94bec12 69d69aa9 .config console log report ci-upstream-kasan-gce-smack-root
2019/01/06 05:32 upstream f1c2f8857c5a 53be0a37 .config console log report ci-upstream-kasan-gce
2019/01/05 16:03 upstream 3fed6ae4b027 53be0a37 .config console log report ci-upstream-kasan-gce-smack-root
2019/01/05 15:33 upstream 3fed6ae4b027 53be0a37 .config console log report ci-upstream-kasan-gce-smack-root
2019/01/04 18:09 upstream 96d4f267e40f 0127e3ba .config console log report ci-upstream-kasan-gce-selinux-root
2019/01/02 03:03 upstream 28e8c4bc8eb4 3d85f48c .config console log report ci-upstream-kasan-gce
2018/12/30 17:06 upstream 195303136f19 9942de5f .config console log report ci-upstream-kasan-gce
2018/12/29 08:09 upstream f346b0becb1b e33ad0f1 .config console log report ci-upstream-kasan-gce-smack-root
2018/12/28 17:21 upstream 00c569b567c7 fc6ae81a .config console log report ci-upstream-kasan-gce-smack-root
2018/12/25 21:42 upstream 8fe28cb58bcb 8a41a0ad .config console log report ci-upstream-kasan-gce
2018/12/24 23:31 upstream 8fe28cb58bcb 8a41a0ad .config console log report ci-upstream-kasan-gce
2019/01/16 12:18 upstream 7939f8beecf1 b47fa78d .config console log report ci-upstream-kasan-gce-386
2019/01/08 03:47 upstream 3bd6e94bec12 69d69aa9 .config console log report ci-upstream-kasan-gce-386
2019/01/18 13:51 linux-next 9673b4aa71ca 5bf17c30 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/01/15 06:59 linux-next 5aa6589e17bd ebacf5cb .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.