====================================================== WARNING: possible circular locking dependency detected 5.15.160-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/3524 is trying to acquire lock: ffff888024cc63f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x213/0x760 fs/jbd2/checkpoint.c:71 but task is already holding lock: ffff888024cc2650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1811 [inline] ffff888024cc2650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1928 [inline] ffff888024cc2650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x375/0x1100 fs/ext4/inode.c:243 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (sb_internal){.+.+}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 percpu_down_read+0x46/0x1b0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1811 [inline] sb_start_intwrite include/linux/fs.h:1928 [inline] ext4_evict_inode+0x375/0x1100 fs/ext4/inode.c:243 evict+0x2a4/0x620 fs/inode.c:587 ext4_ext_migrate+0x100b/0x12f0 fs/ext4/migrate.c:588 __ext4_ioctl fs/ext4/ioctl.c:1028 [inline] ext4_ioctl+0x1935/0x5b80 fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #2 (&sbi->s_writepages_rwsem){++++}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 percpu_down_write+0x52/0x2d0 kernel/locking/percpu-rwsem.c:217 ext4_ind_migrate+0x254/0x760 fs/ext4/migrate.c:625 ext4_ioctl_setflags fs/ext4/ioctl.c:457 [inline] ext4_fileattr_set+0xe8b/0x1750 fs/ext4/ioctl.c:765 vfs_fileattr_set+0x8f3/0xd30 fs/ioctl.c:700 ioctl_setflags fs/ioctl.c:732 [inline] do_vfs_ioctl+0x1d85/0x2b70 fs/ioctl.c:843 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x81/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&sb->s_type->i_mutex_key#9){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 inode_lock_shared include/linux/fs.h:799 [inline] ext4_bmap+0x4b/0x410 fs/ext4/inode.c:3152 bmap+0xa1/0xd0 fs/inode.c:1756 jbd2_journal_bmap fs/jbd2/journal.c:980 [inline] __jbd2_journal_erase fs/jbd2/journal.c:1790 [inline] jbd2_journal_flush+0x7a2/0xc90 fs/jbd2/journal.c:2496 ext4_ioctl_checkpoint fs/ext4/ioctl.c:849 [inline] __ext4_ioctl fs/ext4/ioctl.c:1267 [inline] ext4_ioctl+0x3249/0x5b80 fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 mutex_lock_io_nested+0x45/0x60 kernel/locking/mutex.c:777 __jbd2_log_wait_for_space+0x213/0x760 fs/jbd2/checkpoint.c:71 add_transaction_credits+0x950/0xc00 fs/jbd2/transaction.c:299 start_this_handle+0x747/0x1570 fs/jbd2/transaction.c:423 jbd2__journal_start+0x2d1/0x5c0 fs/jbd2/transaction.c:521 __ext4_journal_start_sb+0x175/0x370 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_evict_inode+0x7dd/0x1100 fs/ext4/inode.c:254 evict+0x2a4/0x620 fs/inode.c:587 do_unlinkat+0x508/0x950 fs/namei.c:4355 __do_sys_unlink fs/namei.c:4396 [inline] __se_sys_unlink fs/namei.c:4394 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4394 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &journal->j_checkpoint_mutex --> &sbi->s_writepages_rwsem --> sb_internal Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_internal); lock(&sbi->s_writepages_rwsem); lock(sb_internal); lock(&journal->j_checkpoint_mutex); *** DEADLOCK *** 2 locks held by syz-executor.4/3524: #0: ffff888024cc2460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 #1: ffff888024cc2650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1811 [inline] #1: ffff888024cc2650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1928 [inline] #1: ffff888024cc2650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x375/0x1100 fs/ext4/inode.c:243 stack backtrace: CPU: 1 PID: 3524 Comm: syz-executor.4 Not tainted 5.15.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 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+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 mutex_lock_io_nested+0x45/0x60 kernel/locking/mutex.c:777 __jbd2_log_wait_for_space+0x213/0x760 fs/jbd2/checkpoint.c:71 add_transaction_credits+0x950/0xc00 fs/jbd2/transaction.c:299 start_this_handle+0x747/0x1570 fs/jbd2/transaction.c:423 jbd2__journal_start+0x2d1/0x5c0 fs/jbd2/transaction.c:521 __ext4_journal_start_sb+0x175/0x370 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_evict_inode+0x7dd/0x1100 fs/ext4/inode.c:254 evict+0x2a4/0x620 fs/inode.c:587 do_unlinkat+0x508/0x950 fs/namei.c:4355 __do_sys_unlink fs/namei.c:4396 [inline] __se_sys_unlink fs/namei.c:4394 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4394 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fcd04caa657 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007ffc89d841c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcd04caa657 RDX: 00007ffc89d841f0 RSI: 00007ffc89d84280 RDI: 00007ffc89d84280 RBP: 00007ffc89d84280 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc89d85330 R13: 00007fcd04d07636 R14: 0000000000020baf R15: 0000000000000002