====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc3-next-20230111 #1 Not tainted ------------------------------------------------------ syz-executor.0/288571 is trying to acquire lock: ffff88800ffb8170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x162/0x310 but task is already holding lock: ffff88800f94eb90 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x17f/0x550 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/0x840 ext4_fileattr_set+0x1521/0x19f0 vfs_fileattr_set+0x7a2/0xbd0 do_vfs_ioctl+0xfa6/0x15d0 __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+0x860/0xc10 __ext4_ioctl+0x9e3/0x43e0 __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+0x9e3/0x43e0 __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+0x2999/0x5e00 lock_acquire.part.0+0x11e/0x340 __mutex_lock+0x136/0x14e0 jbd2_journal_lock_updates+0x162/0x310 ext4_change_inode_journal_flag+0x187/0x550 ext4_fileattr_set+0x14fa/0x19f0 vfs_fileattr_set+0x7a2/0xbd0 do_vfs_ioctl+0xfa6/0x15d0 __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.0/288571: #0: ffff88800f94c438 (sb_writers#3){.+.+}-{0:0}, at: do_vfs_ioctl+0xf6b/0x15d0 #1: ffff88800b4b21d0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: vfs_fileattr_set+0x14c/0xbd0 #2: ffff88800b4b2370 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_change_inode_journal_flag+0x126/0x550 #3: ffff88800f94eb90 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_change_inode_journal_flag+0x17f/0x550 stack backtrace: CPU: 1 PID: 288571 Comm: syz-executor.0 Not tainted 6.2.0-rc3-next-20230111 #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+0x2999/0x5e00 lock_acquire.part.0+0x11e/0x340 __mutex_lock+0x136/0x14e0 jbd2_journal_lock_updates+0x162/0x310 ext4_change_inode_journal_flag+0x187/0x550 ext4_fileattr_set+0x14fa/0x19f0 vfs_fileattr_set+0x7a2/0xbd0 do_vfs_ioctl+0xfa6/0x15d0 __x64_sys_ioctl+0x110/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f4fef52eb19 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:00007f4fecaa4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4fef641f60 RCX: 00007f4fef52eb19 RDX: 0000000020000040 RSI: 0000000040086602 RDI: 0000000000000003 RBP: 00007f4fef588f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe8fd3e32f R14: 00007f4fecaa4300 R15: 0000000000022000 audit: type=1326 audit(1673435733.686:122): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=288578 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f5490a3eb19 code=0x0 audit: type=1326 audit(1673435733.931:123): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=288690 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f4fef52eb19 code=0x0 audit: type=1326 audit(1673435734.850:124): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=288810 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f5490a3eb19 code=0x0 audit: type=1326 audit(1673435734.868:125): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=288838 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f4fef52eb19 code=0x0 audit: type=1326 audit(1673435735.779:126): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=289234 comm="syz-executor.5" exe="/syz-executor.5" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f5490a3eb19 code=0x0 audit: type=1326 audit(1673435735.811:127): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=289241 comm="syz-executor.0" exe="/syz-executor.0" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f4fef52eb19 code=0x0 SELinux: Context system_u:object_r:dhcpd_unit_file_t:s0 is not valid (left unmapped). audit: type=1400 audit(1673435736.738:128): avc: denied { associate } for pid=289774 comm="syz-executor.5" name="ssh.service" dev="cgroup2" ino=1076 scontext=system_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:cgroup_t:s0 tclass=filesystem permissive=1 srawcon="system_u:object_r:dhcpd_unit_file_t:s0" device lo left promiscuous mode device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready device lo left promiscuous mode device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready device lo left promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready device lo entered promiscuous mode device lo left promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready device lo entered promiscuous mode device lo left promiscuous mode device lo entered promiscuous mode