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BUG: scheduling while atomic in exit_to_user_mode_loop

Status: upstream: reported C repro on 2025/05/25 06:17
Reported-by: syzbot+eb504c1673110fdd427e@syzkaller.appspotmail.com
First crash: 219d, last: 4d19h
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: scheduling while atomic in exit_to_user_mode_loop ntfs3 5 syz error error 1 1151d 1178d 0/29 auto-obsoleted due to no activity on 2023/05/14 09:44
linux-6.1 BUG: scheduling while atomic in exit_to_user_mode_loop origin:lts-only 5 C done 3 678d 731d 0/3 upstream: reported C repro on 2023/12/30 14:50
android-5-15 BUG: scheduling while atomic in exit_to_user_mode_loop origin:upstream 5 C done 833 5d18h 731d 0/2 upstream: reported C repro on 2023/12/30 11:04
android-6-1 BUG: scheduling while atomic in exit_to_user_mode_loop 5 C done 1087 549d 731d 0/2 auto-obsoleted due to no activity on 2024/09/07 07:43
linux-5.15 BUG: scheduling while atomic in exit_to_user_mode_loop origin:lts-only 5 syz unreliable 2 680d 686d 0/3 auto-obsoleted due to no activity on 2024/10/07 06:36
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/12/16 14:21 11m retest repro android13-5.10-lts report log
2025/12/16 14:21 10m retest repro android13-5.10-lts report log
2025/10/25 07:38 7m retest repro android13-5.10-lts report log
2025/10/25 07:38 6m retest repro android13-5.10-lts report log
2025/10/25 07:38 7m retest repro android13-5.10-lts report log
2025/10/07 12:55 8m retest repro android13-5.10-lts report log
2025/10/07 12:55 5m retest repro android13-5.10-lts report log
2025/10/07 12:55 9m retest repro android13-5.10-lts report log
2025/08/15 20:45 6m retest repro android13-5.10-lts report log
2025/08/15 20:45 5m retest repro android13-5.10-lts report log
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2025/11/24 20:12 1h31m bisect fix android13-5.10-lts OK (0) job log log
2025/07/08 12:44 1h07m bisect fix android13-5.10-lts OK (0) job log log

Sample crash report:
erofs: (device loop2): mounted with root inode @ nid 36.
erofs: (device loop2): z_erofs_readpage: failed to read, err [-117]
BUG: scheduling while atomic: syz.2.18/373/0x00000002
Modules linked in:
Preemption disabled at:
[<ffffffff82125528>] kmap_atomic include/linux/highmem.h:156 [inline]
[<ffffffff82125528>] z_erofs_reload_indexes+0x318/0x450 fs/erofs/zmap.c:148
CPU: 1 PID: 373 Comm: syz.2.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118
 dump_stack+0x15/0x1c lib/dump_stack.c:135
 __schedule_bug+0x177/0x230 kernel/sched/core.c:4545
 schedule_debug kernel/sched/core.c:4572 [inline]
 __schedule+0xc33/0x1310 kernel/sched/core.c:4700
 schedule+0x13c/0x1d0 kernel/sched/core.c:4884
 exit_to_user_mode_loop+0x4b/0xe0 kernel/entry/common.c:160
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f80351b2749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc56abe518 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffff8b RBX: 00007f8035408fa0 RCX: 00007f80351b2749
RDX: 000000000000275a RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007f8035236f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8035408fa0 R14: 00007f8035408fa0 R15: 0000000000000004

Crashes (16):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/25 21:33 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/09/14 17:53 android13-5.10-lts 911f602c2237 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/07/31 10:49 android13-5.10-lts 1154f779f3f3 f8f2b4da .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/07/31 10:32 android13-5.10-lts 1154f779f3f3 f8f2b4da .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/07/20 14:03 android13-5.10-lts 6de38b5f6c2b 7117feec .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/05/25 06:15 android13-5.10-lts 7e2543346ff7 ed351ea7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/09/14 17:29 android13-5.10-lts 911f602c2237 e2beed91 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/12/25 21:19 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/12/25 21:18 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/12/17 13:14 android13-5.10-lts e253c52bbdfc d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/09/18 00:06 android13-5.10-lts 911f602c2237 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/09/18 00:06 android13-5.10-lts 911f602c2237 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/05/25 06:01 android13-5.10-lts 7e2543346ff7 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/05/25 06:01 android13-5.10-lts 7e2543346ff7 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/05/25 06:01 android13-5.10-lts 7e2543346ff7 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
2025/05/25 06:01 android13-5.10-lts 7e2543346ff7 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 BUG: scheduling while atomic in exit_to_user_mode_loop
* Struck through repros no longer work on HEAD.