Message-ID: <68e54111.a00a0220.298cc0.047e.GAE@google.com>
Date: Tue, 07 Oct 2025 09:34:25 -0700
From: syzbot <syzbot+635fba516c2c7858f799@...kaller.appspotmail.com>
To: chao@...nel.org, jaegeuk@...nel.org, 
	linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [f2fs?] BUG: sleeping function called from invalid context
 in f2fs_drop_inode

Hello,

syzbot found the following issue on:

HEAD commit:    ba9dac987319 Merge tag 'libnvdimm-for-6.18' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=122ab92f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c1486b135ff0ff9b
dashboard link: https://syzkaller.appspot.com/bug?extid=635fba516c2c7858f799
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ba9dac98.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d1fa0e7fa86d/vmlinux-ba9dac98.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fbfd63ebd788/bzImage-ba9dac98.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+635fba516c2c7858f799@...kaller.appspotmail.com

BUG: sleeping function called from invalid context at fs/inode.c:1928
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5328, name: syz.0.0
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
1 lock held by syz.0.0/5328:
 #0: ffff88801fcd9b80 (&sb->s_type->i_lock_key#35){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #0: ffff88801fcd9b80 (&sb->s_type->i_lock_key#35){+.+.}-{3:3}, at: f2fs_drop_inode+0x67e/0x950 fs/f2fs/super.c:1822
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 __might_resched+0x495/0x610 kernel/sched/core.c:8925
 iput+0x2b/0xc50 fs/inode.c:1928
 f2fs_drop_inode+0x686/0x950 fs/f2fs/super.c:1823
 iput_final fs/inode.c:1884 [inline]
 iput+0x6d9/0xc50 fs/inode.c:1966
 __dentry_kill+0x209/0x660 fs/dcache.c:669
 dput+0x19f/0x2b0 fs/dcache.c:911
 __fput+0x68e/0xa70 fs/file_table.c:476
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb96098eec9
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:00007ffd5e7bbf08 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fb960be7da0 RCX: 00007fb96098eec9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb960be7da0 R08: 0000000000018f14 R09: 000000125e7bc1ff
R10: 0000000000de6eb8 R11: 0000000000000246 R12: 0000000000015259
R13: 00007fb960be6090 R14: ffffffffffffffff R15: 00007ffd5e7bc020
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5328 at fs/inode.c:1933 iput+0x38c/0xc50 fs/inode.c:1933
Modules linked in:
CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:iput+0x38c/0xc50 fs/inode.c:1933
Code: 80 3d a0 88 49 0d 01 0f 85 b2 00 00 00 e8 4c 82 80 ff 4c 89 f7 be 10 00 00 00 e8 af 84 06 00 e9 2c fd ff ff e8 35 82 80 ff 90 <0f> 0b 90 e9 70 fd ff ff e8 27 82 80 ff 90 0f 0b 90 e9 d7 fe ff ff
RSP: 0018:ffffc9000d47fbb0 EFLAGS: 00010293
RAX: ffffffff823e919b RBX: 0000000000000001 RCX: ffff888000394900
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff88801fcd9bb8 R08: ffffffff9297b047 R09: 1ffffffff252f608
R10: dffffc0000000000 R11: fffffbfff252f609 R12: ffff88801fcd9ce8
R13: dffffc0000000000 R14: ffff88801fcd9ae8 R15: 1ffffffff1f3c766
FS:  00005555645a1500(0000) GS:ffff88808d30c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb960bd75f0 CR3: 00000000127cb000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 f2fs_drop_inode+0x686/0x950 fs/f2fs/super.c:1823
 iput_final fs/inode.c:1884 [inline]
 iput+0x6d9/0xc50 fs/inode.c:1966
 __dentry_kill+0x209/0x660 fs/dcache.c:669
 dput+0x19f/0x2b0 fs/dcache.c:911
 __fput+0x68e/0xa70 fs/file_table.c:476
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb96098eec9
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:00007ffd5e7bbf08 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fb960be7da0 RCX: 00007fb96098eec9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb960be7da0 R08: 0000000000018f14 R09: 000000125e7bc1ff
R10: 0000000000de6eb8 R11: 0000000000000246 R12: 0000000000015259
R13: 00007fb960be6090 R14: ffffffffffffffff R15: 00007ffd5e7bc020
 </TASK>


---
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