====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc6-next-20221122 #1 Not tainted ------------------------------------------------------ syz-executor.0/8416 is trying to acquire lock: ffff8880108aa170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310 but task is already holding lock: ffff8880108a8b90 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x17b/0x540 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sbi->s_writepages_rwsem){++++}-{0:0}: percpu_down_write+0x51/0x350 ext4_ind_migrate+0x23b/0x830 ext4_fileattr_set+0x1452/0x18c0 vfs_fileattr_set+0x780/0xb90 do_vfs_ioctl+0xa6c/0x1af0 __x64_sys_ioctl+0x110/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc -> #2 (&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+0x9b0/0x4340 __x64_sys_ioctl+0x19e/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc -> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: mutex_lock_io_nested+0x14c/0x1330 jbd2_journal_flush+0x19e/0xc10 __ext4_ioctl+0x9b0/0x4340 __x64_sys_ioctl+0x19e/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc -> #0 (&journal->j_barrier){+.+.}-{3:3}: __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a6/0x530 __mutex_lock+0x136/0x14e0 jbd2_journal_lock_updates+0x162/0x310 ext4_change_inode_journal_flag+0x183/0x540 ext4_fileattr_set+0x142b/0x18c0 vfs_fileattr_set+0x780/0xb90 do_vfs_ioctl+0xa6c/0x1af0 __x64_sys_ioctl+0x110/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc other info that might help us debug this: Chain exists of: &journal->j_barrier --> &sb->s_type->i_mutex_key#6 --> &sbi->s_writepages_rwsem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_writepages_rwsem); lock(&sb->s_type->i_mutex_key#6); lock(&sbi->s_writepages_rwsem); lock(&journal->j_barrier); *** DEADLOCK *** 4 locks held by syz-executor.0/8416: #0: ffff8880108de438 (sb_writers#3){.+.+}-{0:0}, at: do_vfs_ioctl+0xa2f/0x1af0 #1: ffff88801eba5380 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: vfs_fileattr_set+0x14c/0xb90 #2: ffff88801eba5520 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_change_inode_journal_flag+0x122/0x540 #3: ffff8880108a8b90 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x17b/0x540 stack backtrace: CPU: 1 PID: 8416 Comm: syz-executor.0 Not tainted 6.1.0-rc6-next-20221122 #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+0x136/0x14e0 jbd2_journal_lock_updates+0x162/0x310 ext4_change_inode_journal_flag+0x183/0x540 ext4_fileattr_set+0x142b/0x18c0 vfs_fileattr_set+0x780/0xb90 do_vfs_ioctl+0xa6c/0x1af0 __x64_sys_ioctl+0x110/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7fc302450b19 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:00007fc2ff9c6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc302563f60 RCX: 00007fc302450b19 RDX: 0000000020000040 RSI: 0000000040086602 RDI: 0000000000000003 RBP: 00007fc3024aaf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffccc99ddcf R14: 00007fc2ff9c6300 R15: 0000000000022000 netlink: 'syz-executor.5': attribute type 4 has an invalid length. audit: type=1326 audit(1669116285.738:23): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8545 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fe1a13bcb19 code=0x0 netlink: 'syz-executor.5': attribute type 4 has an invalid length. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 'syz-executor.5': attribute type 4 has an invalid length. audit: type=1326 audit(1669116286.575:24): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8545 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fe1a13bcb19 code=0x0 netlink: 'syz-executor.5': attribute type 4 has an invalid length. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. audit: type=1326 audit(1669116286.739:25): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8573 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fc302450b19 code=0x0 audit: type=1326 audit(1669116286.774:26): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8575 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fe1a13bcb19 code=0x0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.3'. audit: type=1326 audit(1669116287.673:27): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8599 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fc302450b19 code=0x0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. audit: type=1326 audit(1669116287.713:28): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8612 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fe1a13bcb19 code=0x0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. audit: type=1326 audit(1669116288.626:29): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8641 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fc302450b19 code=0x0 audit: type=1326 audit(1669116288.672:30): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=8651 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fe1a13bcb19 code=0x0