====================================================== WARNING: possible circular locking dependency detected 5.15.167-syzkaller #0 Not tainted ------------------------------------------------------ syz.1.537/6165 is trying to acquire lock: ffff0000d4100170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x264/0x328 fs/jbd2/transaction.c:905 but task is already holding lock: ffff0000d40fa650 (sb_internal){++++}-{0:0}, at: sb_wait_write fs/super.c:1623 [inline] ffff0000d40fa650 (sb_internal){++++}-{0:0}, at: freeze_super+0x1a8/0x388 fs/super.c:1733 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (sb_internal){++++}-{0:0}: percpu_down_write+0xd8/0x3b0 kernel/locking/percpu-rwsem.c:217 sb_wait_write fs/super.c:1623 [inline] freeze_super+0x1a8/0x388 fs/super.c:1733 freeze_bdev+0x130/0x1f4 block/bdev.c:251 ext4_shutdown fs/ext4/ioctl.c:581 [inline] __ext4_ioctl fs/ext4/ioctl.c:1248 [inline] ext4_ioctl+0x3258/0x61bc fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #4 (sb_pagefaults){++++}-{0:0}: percpu_down_read+0xec/0x3a8 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1811 [inline] sb_start_pagefault include/linux/fs.h:1910 [inline] ext4_page_mkwrite+0x170/0x10c4 fs/ext4/inode.c:6124 do_page_mkwrite+0x144/0x37c mm/memory.c:2892 wp_page_shared+0x14c/0x398 mm/memory.c:3229 do_wp_page+0x7cc/0x9c4 mm/memory.c:3330 handle_pte_fault mm/memory.c:4638 [inline] __handle_mm_fault mm/memory.c:4755 [inline] handle_mm_fault+0x1bdc/0x33a8 mm/memory.c:4853 __do_page_fault arch/arm64/mm/fault.c:505 [inline] do_page_fault+0x700/0xb60 arch/arm64/mm/fault.c:605 do_mem_abort+0x70/0x1d8 arch/arm64/mm/fault.c:819 el0_da+0x94/0x20c arch/arm64/kernel/entry-common.c:494 el0t_64_sync_handler+0xc0/0xe4 arch/arm64/kernel/entry-common.c:629 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #3 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc8/0x128 mm/memory.c:5327 fault_in_readable+0xdc/0x56c mm/gup.c:1793 fault_in_iov_iter_readable+0x130/0x1b0 lib/iov_iter.c:460 generic_perform_write+0x198/0x520 mm/filemap.c:3775 ext4_buffered_write_iter+0x3fc/0x528 fs/ext4/file.c:268 ext4_file_write_iter+0x688/0x162c call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x884/0xb44 fs/read_write.c:594 ksys_write+0x15c/0x26c fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:656 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #2 (&sb->s_type->i_mutex_key#9){++++}-{3:3}: down_read+0xc0/0x398 kernel/locking/rwsem.c:1498 inode_lock_shared include/linux/fs.h:799 [inline] ext4_bmap+0x58/0x36c fs/ext4/inode.c:3163 bmap+0xa8/0xe8 fs/inode.c:1791 jbd2_journal_bmap fs/jbd2/journal.c:981 [inline] __jbd2_journal_erase fs/jbd2/journal.c:1796 [inline] jbd2_journal_flush+0x63c/0xaa0 fs/jbd2/journal.c:2502 ext4_ioctl_checkpoint fs/ext4/ioctl.c:849 [inline] __ext4_ioctl fs/ext4/ioctl.c:1267 [inline] ext4_ioctl+0x3454/0x61bc fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: __mutex_lock_common+0x194/0x2154 kernel/locking/mutex.c:596 mutex_lock_io_nested+0xcc/0x12c kernel/locking/mutex.c:777 jbd2_journal_flush+0x210/0xaa0 fs/jbd2/journal.c:2474 ext4_ioctl_checkpoint fs/ext4/ioctl.c:849 [inline] __ext4_ioctl fs/ext4/ioctl.c:1267 [inline] ext4_ioctl+0x3454/0x61bc fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #0 (&journal->j_barrier){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x2154 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743 jbd2_journal_lock_updates+0x264/0x328 fs/jbd2/transaction.c:905 ext4_freeze+0x98/0x208 fs/ext4/super.c:5694 freeze_super+0x1ec/0x388 fs/super.c:1736 freeze_bdev+0x130/0x1f4 block/bdev.c:251 ext4_shutdown fs/ext4/ioctl.c:581 [inline] __ext4_ioctl fs/ext4/ioctl.c:1248 [inline] ext4_ioctl+0x3258/0x61bc fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 other info that might help us debug this: Chain exists of: &journal->j_barrier --> sb_pagefaults --> sb_internal Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_internal); lock(sb_pagefaults); lock(sb_internal); lock(&journal->j_barrier); *** DEADLOCK *** 5 locks held by syz.1.537/6165: #0: ffff0000c04829a0 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: freeze_bdev+0x3c/0x1f4 block/bdev.c:241 #1: ffff0000d40fa460 (sb_writers#3){++++}-{0:0}, at: sb_wait_write fs/super.c:1623 [inline] #1: ffff0000d40fa460 (sb_writers#3){++++}-{0:0}, at: freeze_super+0xfc/0x388 fs/super.c:1714 #2: ffff0000d40fa0e0 (&type->s_umount_key#30){++++}-{3:3}, at: freeze_super+0x104/0x388 fs/super.c:1715 #3: ffff0000d40fa558 (sb_pagefaults){++++}-{0:0}, at: sb_wait_write fs/super.c:1623 [inline] #3: ffff0000d40fa558 (sb_pagefaults){++++}-{0:0}, at: freeze_super+0x11c/0x388 fs/super.c:1719 #4: ffff0000d40fa650 (sb_internal){++++}-{0:0}, at: sb_wait_write fs/super.c:1623 [inline] #4: ffff0000d40fa650 (sb_internal){++++}-{0:0}, at: freeze_super+0x1a8/0x388 fs/super.c:1733 stack backtrace: CPU: 0 PID: 6165 Comm: syz.1.537 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2011 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x2154 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743 jbd2_journal_lock_updates+0x264/0x328 fs/jbd2/transaction.c:905 ext4_freeze+0x98/0x208 fs/ext4/super.c:5694 freeze_super+0x1ec/0x388 fs/super.c:1736 freeze_bdev+0x130/0x1f4 block/bdev.c:251 ext4_shutdown fs/ext4/ioctl.c:581 [inline] __ext4_ioctl fs/ext4/ioctl.c:1248 [inline] ext4_ioctl+0x3258/0x61bc fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584