====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc3-next-20221107 #1 Not tainted ------------------------------------------------------ syz-executor.0/21326 is trying to acquire lock: ffff88800fc263f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: __jbd2_log_wait_for_space+0x238/0x460 but task is already holding lock: ffff88801b6fbfa0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 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+0x9c/0x450 ext4_bmap+0x52/0x470 bmap+0xb0/0x130 jbd2_journal_bmap+0xac/0x190 jbd2_journal_flush+0x857/0xc10 __ext4_ioctl+0x9c1/0x4140 __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+0x2a02/0x5e70 lock_acquire+0x1a6/0x530 mutex_lock_io_nested+0x14c/0x1330 __jbd2_log_wait_for_space+0x238/0x460 add_transaction_credits+0xa42/0xb80 start_this_handle+0x3ac/0x14c0 jbd2__journal_start+0x394/0x8d0 __ext4_journal_start_sb+0x395/0x470 ext4_dirty_inode+0xa1/0x110 __mark_inode_dirty+0x1aa/0xe70 generic_write_end+0x319/0x3d0 ext4_da_write_end+0x162/0x930 generic_perform_write+0x318/0x580 ext4_buffered_write_iter+0x164/0x460 ext4_file_write_iter+0x3ff/0x1910 vfs_write+0x9c7/0xd90 ksys_write+0x12b/0x260 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 *** 3 locks held by syz-executor.0/21326: #0: ffff88800ea00d68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xeb/0x110 #1: ffff88800fc22438 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x12b/0x260 #2: ffff88801b6fbfa0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 stack backtrace: CPU: 1 PID: 21326 Comm: syz-executor.0 Not tainted 6.1.0-rc3-next-20221107 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x8f/0xb7 check_noncircular+0x263/0x2e0 __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a6/0x530 mutex_lock_io_nested+0x14c/0x1330 __jbd2_log_wait_for_space+0x238/0x460 add_transaction_credits+0xa42/0xb80 start_this_handle+0x3ac/0x14c0 jbd2__journal_start+0x394/0x8d0 __ext4_journal_start_sb+0x395/0x470 ext4_dirty_inode+0xa1/0x110 __mark_inode_dirty+0x1aa/0xe70 generic_write_end+0x319/0x3d0 ext4_da_write_end+0x162/0x930 generic_perform_write+0x318/0x580 ext4_buffered_write_iter+0x164/0x460 ext4_file_write_iter+0x3ff/0x1910 vfs_write+0x9c7/0xd90 ksys_write+0x12b/0x260 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f2da929cb19 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:00007f2da67f1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2da93b0020 RCX: 00007f2da929cb19 RDX: 0000000000041030 RSI: 0000000020000080 RDI: 0000000000000008 RBP: 00007f2da92f6f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe180f731f R14: 00007f2da67f1300 R15: 0000000000022000 audit: type=1326 audit(2000000165.707:35): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=21400 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f189e8a0b19 code=0x0 tmpfs: Bad value for 'mpol' tmpfs: Bad value for 'mpol' netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 'syz-executor.3': attribute type 1 has an invalid length. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. syz_tun: refused to change device tx_queue_len netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. syz_tun: refused to change device tx_queue_len netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. syz_tun: refused to change device tx_queue_len netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. syz_tun: refused to change device tx_queue_len netlink: 'syz-executor.7': attribute type 309 has an invalid length. netlink: 'syz-executor.7': attribute type 309 has an invalid length. syz_tun: refused to change device tx_queue_len netlink: 'syz-executor.7': attribute type 309 has an invalid length. audit: type=1400 audit(2000000171.761:36): avc: denied { map } for pid=21776 comm="syz-executor.4" path="pipe:[59455]" dev="pipefs" ino=59455 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=fifo_file permissive=1 netlink: 'syz-executor.7': attribute type 309 has an invalid length. netlink: 'syz-executor.7': attribute type 309 has an invalid length.