EXT4-fs (loop7): shut down requested (0) ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc6-syzkaller-00047-ge9565e23cd89 #0 Not tainted ------------------------------------------------------ syz.7.680/12580 is trying to acquire lock: ffff88807f22e610 (sb_internal){++++}-{0:0}, at: sb_wait_write fs/super.c:1855 [inline] ffff88807f22e610 (sb_internal){++++}-{0:0}, at: freeze_super+0x7aa/0xeb0 fs/super.c:2063 but task is already holding lock: ffff88807f22e518 (sb_pagefaults){++++}-{0:0}, at: sb_wait_write fs/super.c:1855 [inline] ffff88807f22e518 (sb_pagefaults){++++}-{0:0}, at: freeze_super+0x4f1/0xeb0 fs/super.c:2049 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (sb_pagefaults){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:52 __sb_start_write include/linux/fs.h:1783 [inline] sb_start_pagefault include/linux/fs.h:1948 [inline] ext4_page_mkwrite+0x1de/0x1110 fs/ext4/inode.c:6220 do_page_mkwrite+0x14d/0x310 mm/memory.c:3287 do_shared_fault mm/memory.c:5594 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x18d2/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #3 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __might_fault+0xcc/0x130 mm/memory.c:7151 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2c/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] fiemap_fill_next_extent+0x1c0/0x390 fs/ioctl.c:145 ocfs2_fiemap+0x888/0xc90 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1638/0x1eb0 fs/ioctl.c:840 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ocfs2_create_local_dquot+0x19d/0x1a40 fs/ocfs2/quota_local.c:1227 ocfs2_acquire_dquot+0x80f/0xb30 fs/ocfs2/quota_global.c:883 dqget+0x7b1/0xf10 fs/quota/dquot.c:977 __dquot_initialize+0x3b3/0xcb0 fs/quota/dquot.c:1505 ocfs2_get_init_inode+0x13b/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x863/0x2050 fs/ocfs2/namei.c:310 ocfs2_create+0x1a5/0x440 fs/ocfs2/namei.c:673 lookup_open fs/namei.c:3701 [inline] open_last_lookups fs/namei.c:3800 [inline] path_openat+0x14f1/0x3830 fs/namei.c:4036 do_filp_open+0x1fa/0x410 fs/namei.c:4066 do_sys_openat2+0x121/0x1c0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_creat fs/open.c:1522 [inline] __se_sys_creat fs/open.c:1516 [inline] __x64_sys_creat+0x8f/0xc0 fs/open.c:1516 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&dquot->dq_lock){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746 dquot_release+0x66/0x600 fs/quota/dquot.c:531 ext4_release_dquot+0x3ee/0x6c0 fs/ext4/ext4_jbd2.h:-1 quota_release_workfn+0x35c/0x610 fs/quota/dquot.c:840 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #0 (sb_internal){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 percpu_down_write+0x54/0x330 kernel/locking/percpu-rwsem.c:229 sb_wait_write fs/super.c:1855 [inline] freeze_super+0x7aa/0xeb0 fs/super.c:2063 fs_bdev_freeze+0x19f/0x310 fs/super.c:1484 bdev_freeze+0xd8/0x220 block/bdev.c:298 ext4_force_shutdown+0x322/0x560 fs/ext4/ioctl.c:822 ext4_ioctl_shutdown fs/ext4/ioctl.c:857 [inline] __ext4_ioctl fs/ext4/ioctl.c:1581 [inline] ext4_ioctl+0x1d1d/0x34f0 fs/ext4/ioctl.c:1620 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: sb_internal --> &mm->mmap_lock --> sb_pagefaults Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_pagefaults); lock(&mm->mmap_lock); lock(sb_pagefaults); lock(sb_internal); *** DEADLOCK *** 4 locks held by syz.7.680/12580: #0: ffff888022850d30 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:289 #1: ffff88807f22e420 (sb_writers#4){++++}-{0:0}, at: sb_wait_write fs/super.c:1855 [inline] #1: ffff88807f22e420 (sb_writers#4){++++}-{0:0}, at: freeze_super+0x4c2/0xeb0 fs/super.c:2044 #2: ffff88807f22e0e0 (&type->s_umount_key#31){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #2: ffff88807f22e0e0 (&type->s_umount_key#31){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #2: ffff88807f22e0e0 (&type->s_umount_key#31){++++}-{4:4}, at: freeze_super+0x4ca/0xeb0 fs/super.c:2045 #3: ffff88807f22e518 (sb_pagefaults){++++}-{0:0}, at: sb_wait_write fs/super.c:1855 [inline] #3: ffff88807f22e518 (sb_pagefaults){++++}-{0:0}, at: freeze_super+0x4f1/0xeb0 fs/super.c:2049 stack backtrace: CPU: 1 UID: 0 PID: 12580 Comm: syz.7.680 Not tainted 6.15.0-rc6-syzkaller-00047-ge9565e23cd89 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 percpu_down_write+0x54/0x330 kernel/locking/percpu-rwsem.c:229 sb_wait_write fs/super.c:1855 [inline] freeze_super+0x7aa/0xeb0 fs/super.c:2063 fs_bdev_freeze+0x19f/0x310 fs/super.c:1484 bdev_freeze+0xd8/0x220 block/bdev.c:298 ext4_force_shutdown+0x322/0x560 fs/ext4/ioctl.c:822 ext4_ioctl_shutdown fs/ext4/ioctl.c:857 [inline] __ext4_ioctl fs/ext4/ioctl.c:1581 [inline] ext4_ioctl+0x1d1d/0x34f0 fs/ext4/ioctl.c:1620 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f96a878e969 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:00007f96a960a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f96a89b5fa0 RCX: 00007f96a878e969 RDX: 0000200000000080 RSI: 000000008004587d RDI: 0000000000000005 RBP: 00007f96a8810ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f96a89b5fa0 R15: 00007fff5ec077c8