====================================================== WARNING: possible circular locking dependency detected 6.13.0-syzkaller-09760-g69e858e0b8b2 #0 Not tainted ------------------------------------------------------ syz.1.6889/30578 is trying to acquire lock: ffff88807b67c140 (&sbi->pipe_mutex){+.+.}-{4:4}, at: autofs_write fs/autofs/waitq.c:55 [inline] ffff88807b67c140 (&sbi->pipe_mutex){+.+.}-{4:4}, at: autofs_notify_daemon+0x499/0xd50 fs/autofs/waitq.c:164 but task is already holding lock: ffff88806576fc88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&of->mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730 kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325 iter_file_splice_write+0x90f/0x10b0 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] do_splice+0x146a/0x1f70 fs/splice.c:1354 __do_splice+0x327/0x360 fs/splice.c:1436 __do_sys_splice fs/splice.c:1639 [inline] __se_sys_splice fs/splice.c:1621 [inline] __x64_sys_splice+0x187/0x250 fs/splice.c:1621 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&pipe->mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730 pipe_write+0x166/0x1b30 fs/pipe.c:456 __kernel_write_iter+0x71f/0xa90 fs/read_write.c:612 __kernel_write+0xf6/0x140 fs/read_write.c:632 autofs_write fs/autofs/waitq.c:57 [inline] autofs_notify_daemon+0x4ce/0xd50 fs/autofs/waitq.c:164 autofs_wait+0x10b5/0x1a30 fs/autofs/waitq.c:426 autofs_mount_wait+0x132/0x380 fs/autofs/root.c:255 autofs_d_automount+0x390/0x7f0 fs/autofs/root.c:401 follow_automount fs/namei.c:1454 [inline] __traverse_mounts+0x192/0x760 fs/namei.c:1499 traverse_mounts fs/namei.c:1528 [inline] handle_mounts fs/namei.c:1631 [inline] step_into+0x593/0x2220 fs/namei.c:1952 walk_component+0xfc/0x5b0 fs/namei.c:2120 lookup_last fs/namei.c:2612 [inline] path_lookupat+0x17f/0x770 fs/namei.c:2636 filename_lookup+0x221/0x5f0 fs/namei.c:2665 vfs_statx+0xf8/0x1c0 fs/stat.c:344 vfs_fstatat fs/stat.c:366 [inline] vfs_lstat include/linux/fs.h:3477 [inline] __do_sys_newlstat+0xb1/0x140 fs/stat.c:516 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sbi->pipe_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730 autofs_write fs/autofs/waitq.c:55 [inline] autofs_notify_daemon+0x499/0xd50 fs/autofs/waitq.c:164 autofs_wait+0x10b5/0x1a30 fs/autofs/waitq.c:426 autofs_mount_wait+0x132/0x380 fs/autofs/root.c:255 autofs_d_automount+0x390/0x7f0 fs/autofs/root.c:401 follow_automount fs/namei.c:1454 [inline] __traverse_mounts+0x192/0x760 fs/namei.c:1499 traverse_mounts fs/namei.c:1528 [inline] handle_mounts fs/namei.c:1631 [inline] step_into+0x593/0x2220 fs/namei.c:1952 walk_component+0xfc/0x5b0 fs/namei.c:2120 lookup_last fs/namei.c:2612 [inline] path_lookupat+0x17f/0x770 fs/namei.c:2636 filename_lookup+0x221/0x5f0 fs/namei.c:2665 kern_path+0x35/0x50 fs/namei.c:2773 lookup_bdev+0xd9/0x280 block/bdev.c:1163 resume_store+0x1d8/0x460 kernel/power/hibernate.c:1247 kobj_attr_store+0x55/0x80 lib/kobject.c:840 sysfs_kf_write+0x117/0x170 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x33d/0x500 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &sbi->pipe_mutex --> &pipe->mutex --> &of->mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&of->mutex); lock(&pipe->mutex); lock(&of->mutex); lock(&sbi->pipe_mutex); *** DEADLOCK *** 4 locks held by syz.1.6889/30578: #0: ffff888029aa7278 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x267/0x390 fs/file.c:1192 #1: ffff888030642420 (sb_writers#9){.+.+}-{0:0}, at: ksys_write+0x12b/0x250 fs/read_write.c:731 #2: ffff88806576fc88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x27b/0x500 fs/kernfs/file.c:325 #3: ffff88801d699788 (kn->active#59){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x29e/0x500 fs/kernfs/file.c:326 stack backtrace: CPU: 1 UID: 0 PID: 30578 Comm: syz.1.6889 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x490/0x760 kernel/locking/lockdep.c:2076 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730 autofs_write fs/autofs/waitq.c:55 [inline] autofs_notify_daemon+0x499/0xd50 fs/autofs/waitq.c:164 autofs_wait+0x10b5/0x1a30 fs/autofs/waitq.c:426 autofs_mount_wait+0x132/0x380 fs/autofs/root.c:255 autofs_d_automount+0x390/0x7f0 fs/autofs/root.c:401 follow_automount fs/namei.c:1454 [inline] __traverse_mounts+0x192/0x760 fs/namei.c:1499 traverse_mounts fs/namei.c:1528 [inline] handle_mounts fs/namei.c:1631 [inline] step_into+0x593/0x2220 fs/namei.c:1952 walk_component+0xfc/0x5b0 fs/namei.c:2120 lookup_last fs/namei.c:2612 [inline] path_lookupat+0x17f/0x770 fs/namei.c:2636 filename_lookup+0x221/0x5f0 fs/namei.c:2665 kern_path+0x35/0x50 fs/namei.c:2773 lookup_bdev+0xd9/0x280 block/bdev.c:1163 resume_store+0x1d8/0x460 kernel/power/hibernate.c:1247 kobj_attr_store+0x55/0x80 lib/kobject.c:840 sysfs_kf_write+0x117/0x170 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x33d/0x500 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4af318cda9 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:00007f4af3f17038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f4af33a6320 RCX: 00007f4af318cda9 RDX: 0000000000000012 RSI: 00000000200000c0 RDI: 0000000000000008 RBP: 00007f4af320e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4af33a6320 R15: 00007ffde85b1db8 PM: Image not found (code -22)