REISERFS (device loop1): using 3.5.x disk format REISERFS (device loop1): Created .reiserfs_priv - reserved for xattr storage. ====================================================== WARNING: possible circular locking dependency detected 6.7.0-rc3-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/6801 is trying to acquire lock: ffff888029b84418 (sb_writers#29){.+.+}-{0:0}, at: reiserfs_ioctl+0x194/0x2e0 fs/reiserfs/ioctl.c:103 but task is already holding lock: ffff888050ebc090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sbi->lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:747 reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 map_block_for_writepage+0x2c8/0x18e0 fs/reiserfs/inode.c:2380 reiserfs_write_full_folio fs/reiserfs/inode.c:2576 [inline] reiserfs_writepage+0x6f2/0x1340 fs/reiserfs/inode.c:2729 writepage_cb+0x64/0x180 mm/page-writeback.c:2537 write_cache_pages+0x499/0xd80 mm/page-writeback.c:2474 do_writepages+0x2f6/0x690 mm/page-writeback.c:2558 filemap_fdatawrite_wbc mm/filemap.c:387 [inline] filemap_fdatawrite_wbc+0x144/0x1b0 mm/filemap.c:377 __filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:420 file_write_and_wait_range+0xcc/0x140 mm/filemap.c:778 reiserfs_sync_file+0x72/0x320 fs/reiserfs/file.c:151 vfs_fsync_range+0x141/0x220 fs/sync.c:188 generic_write_sync include/linux/fs.h:2653 [inline] generic_file_write_iter+0x2a8/0x350 mm/filemap.c:4043 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x64f/0xdf0 fs/read_write.c:584 ksys_write+0x12f/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #0 (sb_writers#29){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2433/0x3b20 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1635 [inline] sb_start_write include/linux/fs.h:1710 [inline] mnt_want_write_file+0x98/0x600 fs/namespace.c:448 reiserfs_ioctl+0x194/0x2e0 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->lock); lock(sb_writers#29); lock(&sbi->lock); rlock(sb_writers#29); *** DEADLOCK *** 1 lock held by syz-executor.1/6801: #0: ffff888050ebc090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 stack backtrace: CPU: 2 PID: 6801 Comm: syz-executor.1 Not tainted 6.7.0-rc3-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x317/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2433/0x3b20 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1635 [inline] sb_start_write include/linux/fs.h:1710 [inline] mnt_want_write_file+0x98/0x600 fs/namespace.c:448 reiserfs_ioctl+0x194/0x2e0 fs/reiserfs/ioctl.c:103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fad1227cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fad130b20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fad1239bf80 RCX: 00007fad1227cae9 RDX: 0000000000000000 RSI: 0000000040087602 RDI: 0000000000000004 RBP: 00007fad122c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fad1239bf80 R15: 00007ffdf6f55428