====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc6-next-20230203 #1 Not tainted ------------------------------------------------------ syz-executor.3/15260 is trying to acquire lock: ffff88800ff103f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x238/0x4b0 but task is already holding lock: ffff88801b9ff150 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_fallocate+0x2e1/0x3f50 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#6){++++}-{3:3}: down_read+0x3d/0x50 ext4_bmap+0x52/0x470 bmap+0xb0/0x130 jbd2_journal_bmap+0xac/0x1d0 jbd2_journal_flush+0x87f/0xc90 __ext4_ioctl+0x9fd/0x4330 __x64_sys_ioctl+0x19e/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc -> #0 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: __lock_acquire+0x2da7/0x63b0 lock_acquire.part.0+0xec/0x320 mutex_lock_io_nested+0x149/0x1300 __jbd2_log_wait_for_space+0x238/0x4b0 add_transaction_credits+0xa42/0xb80 start_this_handle+0x3a6/0x14d0 jbd2__journal_start+0x394/0x6b0 __ext4_journal_start_sb+0x4c2/0x6f0 ext4_alloc_file_blocks.isra.0+0x2a2/0xbd0 ext4_fallocate+0x437/0x3f50 vfs_fallocate+0x48d/0xe30 __x64_sys_fallocate+0xd3/0x140 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#6); lock(&journal->j_checkpoint_mutex); lock(&sb->s_type->i_mutex_key#6); lock(&journal->j_checkpoint_mutex); *** DEADLOCK *** 2 locks held by syz-executor.3/15260: #0: ffff88800cf94438 (sb_writers#3){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd3/0x140 #1: ffff88801b9ff150 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_fallocate+0x2e1/0x3f50 stack backtrace: CPU: 1 PID: 15260 Comm: syz-executor.3 Not tainted 6.2.0-rc6-next-20230203 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x91/0xf0 check_noncircular+0x263/0x2e0 __lock_acquire+0x2da7/0x63b0 lock_acquire.part.0+0xec/0x320 mutex_lock_io_nested+0x149/0x1300 __jbd2_log_wait_for_space+0x238/0x4b0 add_transaction_credits+0xa42/0xb80 start_this_handle+0x3a6/0x14d0 jbd2__journal_start+0x394/0x6b0 __ext4_journal_start_sb+0x4c2/0x6f0 ext4_alloc_file_blocks.isra.0+0x2a2/0xbd0 ext4_fallocate+0x437/0x3f50 vfs_fallocate+0x48d/0xe30 __x64_sys_fallocate+0xd3/0x140 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7fef4c6aeb19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fef49c24188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fef4c7c1f60 RCX: 00007fef4c6aeb19 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007fef4c708f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000040cf77eb R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe85d924ff R14: 00007fef49c24300 R15: 0000000000022000 loop7: detected capacity change from 0 to 208 loop7: detected capacity change from 0 to 208 loop1: detected capacity change from 0 to 208 Bluetooth: hci3: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci3: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci3: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci3: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci3: unexpected cc 0x0c25 length: 249 > 3 Bluetooth: hci3: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci2: Opcode 0x c03 failed: -110 Bluetooth: hci3: command 0x0409 tx timeout Bluetooth: hci3: command 0x041b tx timeout Bluetooth: hci3: command 0x040f tx timeout Bluetooth: hci2: Opcode 0x c03 failed: -110