I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 17 prio class 2 sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 ====================================================== WARNING: possible circular locking dependency detected buffer_io_error: 318 callbacks suppressed Buffer I/O error on dev sr0, logical block 0, async page read 6.0.0-rc2-next-20220826 #1 Not tainted ------------------------------------------------------ syz-executor.5/5113 is trying to acquire lock: ffff88800c9c0400 sr 1:0:0:0: [sr0] tag#0 unaligned transfer (&sb->s_type->i_mutex_key I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 #6 Buffer I/O error on dev sr0, logical block 1, async page read ){++++}-{3:3} sr 1:0:0:0: [sr0] tag#0 unaligned transfer , at: ext4_bmap+0x4e/0x470 I/O error, dev sr0, sector 2 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 but task is already holding lock: Buffer I/O error on dev sr0, logical block 2, async page read ffff8880100623f8 (&journal->j_checkpoint_mutex sr 1:0:0:0: [sr0] tag#0 unaligned transfer ){+.+.}-{3:3} I/O error, dev sr0, sector 3 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 , at: jbd2_journal_flush+0x48b/0xc00 Buffer I/O error on dev sr0, logical block 3, async page read which lock already depends on the new lock. sr 1:0:0:0: [sr0] tag#0 unaligned transfer the existing dependency chain (in reverse order) is: I/O error, dev sr0, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 -> #3 Buffer I/O error on dev sr0, logical block 4, async page read (&journal->j_checkpoint_mutex){+.+.}-{3:3} sr 1:0:0:0: [sr0] tag#0 unaligned transfer : mutex_lock_io_nested+0x148/0x1310 jbd2_journal_flush+0x19a/0xc00 I/O error, dev sr0, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 __ext4_ioctl+0x9e9/0x4090 Buffer I/O error on dev sr0, logical block 5, async page read __x64_sys_ioctl+0x19a/0x210 sr 1:0:0:0: [sr0] tag#0 unaligned transfer do_syscall_64+0x3b/0x90 I/O error, dev sr0, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 entry_SYSCALL_64_after_hwframe+0x63/0xcd Buffer I/O error on dev sr0, logical block 6, async page read -> #2 (&journal->j_barrier sr 1:0:0:0: [sr0] tag#0 unaligned transfer ){+.+.}-{3:3} I/O error, dev sr0, sector 7 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 : __mutex_lock+0x136/0x14d0 Buffer I/O error on dev sr0, logical block 7, async page read jbd2_journal_lock_updates+0x15e/0x310 ext4_change_inode_journal_flag+0x17f/0x530 ext4_fileattr_set+0x140d/0x18a0 vfs_fileattr_set+0x77c/0xb80 do_vfs_ioctl+0xfc2/0x1610 __x64_sys_ioctl+0x10c/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&sbi->s_writepages_rwsem){++++}-{0:0}: percpu_down_write+0x4d/0x3d0 ext4_ind_migrate+0x237/0x830 ext4_fileattr_set+0x1434/0x18a0 vfs_fileattr_set+0x77c/0xb80 do_vfs_ioctl+0xfc2/0x1610 __x64_sys_ioctl+0x10c/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}: __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a2/0x530 down_read+0x98/0x450 ext4_bmap+0x4e/0x470 bmap+0xac/0x120 jbd2_journal_bmap+0xa8/0x180 jbd2_journal_flush+0x853/0xc00 __ext4_ioctl+0x9e9/0x4090 __x64_sys_ioctl+0x19a/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#6 --> &journal->j_barrier --> &journal->j_checkpoint_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&journal->j_checkpoint_mutex); lock(&journal->j_barrier); lock(&journal->j_checkpoint_mutex); lock(&sb->s_type->i_mutex_key#6); *** DEADLOCK *** 2 locks held by syz-executor.5/5113: #0: ffff888010062170 (&journal->j_barrier){+.+.}-{3:3}, at: jbd2_journal_lock_updates+0x15e/0x310 #1: ffff8880100623f8 (&journal->j_checkpoint_mutex){+.+.}-{3:3}, at: jbd2_journal_flush+0x48b/0xc00 stack backtrace: CPU: 0 PID: 5113 Comm: syz-executor.5 Not tainted 6.0.0-rc2-next-20220826 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 check_noncircular+0x263/0x2e0 __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a2/0x530 down_read+0x98/0x450 ext4_bmap+0x4e/0x470 bmap+0xac/0x120 jbd2_journal_bmap+0xa8/0x180 jbd2_journal_flush+0x853/0xc00 __ext4_ioctl+0x9e9/0x4090 __x64_sys_ioctl+0x19a/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f6e9aeb1b19 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:00007f6e98427188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6e9afc4f60 RCX: 00007f6e9aeb1b19 RDX: 0000000020000340 RSI: 000000004004662b RDI: 0000000000000004 RBP: 00007f6e9af0bf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffad217f0f R14: 00007f6e98427300 R15: 0000000000022000 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=278 sclass=netlink_xfrm_socket pid=5106 comm=syz-executor.4 sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive.