BUG: scheduling while atomic in kernfs_drain

Status: premoderation: reported on 2026/08/01 01:34
Reported-by: syzbot+69c853ee63005ce8447d@syzkaller.appspotmail.com
First crash: 6d03h, last: 6d03h

Sample crash report:
BUG: scheduling while atomic: syz.3.88/636/0x00000002
Modules linked in:
CPU: 0 UID: 0 PID: 636 Comm: syz.3.88 Not tainted syzkaller #0 200dea8a17c83f35b0a1e1238c384757fc17b797
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 __schedule_bug+0x12b/0x200 kernel/sched/core.c:6626
 schedule_debug kernel/sched/core.c:6653 [inline]
 __schedule+0xb85/0x20b0 kernel/sched/core.c:7697
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 kernfs_drain+0x278/0x420 fs/kernfs/dir.c:507
 __kernfs_remove+0x402/0x940 fs/kernfs/dir.c:1524
 kernfs_remove_by_name_ns+0x100/0x180 fs/kernfs/dir.c:1742
 sysfs_remove_file_ns+0x68/0x80 fs/sysfs/file.c:506
 sysfs_remove_file include/linux/sysfs.h:773 [inline]
 device_remove_file drivers/base/core.c:3074 [inline]
 device_del+0x56c/0xcf0 drivers/base/core.c:3879
 device_unregister drivers/base/core.c:3922 [inline]
 device_destroy+0xb0/0x100 drivers/base/core.c:4521
 android_device_destroy+0x118/0x180 drivers/usb/gadget/android_configfs_uevent.c:223
 gadgets_drop+0x1d/0x30 drivers/usb/gadget/configfs.c:2075
 client_drop_item fs/configfs/dir.c:943 [inline]
 configfs_rmdir+0x8b7/0x9b0 fs/configfs/dir.c:1546
 vfs_rmdir+0x3de/0x560 fs/namei.c:4348
 do_rmdir+0x29a/0x590 fs/namei.c:4407
 __do_sys_rmdir fs/namei.c:4426 [inline]
 __se_sys_rmdir fs/namei.c:4424 [inline]
 __x64_sys_rmdir+0x4b/0x60 fs/namei.c:4424
 x64_sys_call+0xaf7/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:85
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fcf16d9e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcf17ba1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00007fcf17026090 RCX: 00007fcf16d9e019
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000600
RBP: 00007fcf16e3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcf17026128 R14: 00007fcf17026090 R15: 00007fffc5d8a5c8
 </TASK>
BUG: scheduling while atomic: syz.3.88/636/0x00000000
Modules linked in:
CPU: 0 UID: 0 PID: 636 Comm: syz.3.88 Tainted: G        W          syzkaller #0 200dea8a17c83f35b0a1e1238c384757fc17b797
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 __schedule_bug+0x12b/0x200 kernel/sched/core.c:6626
 schedule_debug kernel/sched/core.c:6653 [inline]
 __schedule+0xb85/0x20b0 kernel/sched/core.c:7697
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 futex_wait_queue+0xfc/0x240 kernel/futex/waitwake.c:376
 __futex_wait+0x15b/0x3d0 kernel/futex/waitwake.c:677
 futex_wait+0x128/0x7c0 kernel/futex/waitwake.c:706
 do_futex+0x32a/0x510 kernel/futex/syscalls.c:132
 __do_sys_futex kernel/futex/syscalls.c:209 [inline]
 __se_sys_futex+0x13c/0x320 kernel/futex/syscalls.c:190
 __x64_sys_futex+0xe9/0x110 kernel/futex/syscalls.c:190
 x64_sys_call+0x227f/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:203
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fcf16d9e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcf17ba10e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fcf17026098 RCX: 00007fcf16d9e019
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fcf17026098
RBP: 00007fcf17026090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcf17026128 R14: 00007fffc5d8a4e0 R15: 00007fffc5d8a5c8
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/01 01:33 android16-6.12 1a138e24e292 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust BUG: scheduling while atomic in kernfs_drain
* Struck through repros no longer work on HEAD.