Hi, I noticed that once a while my system generates a WARNING during shutdown and this has been ongoing for some time, perhaps since upgrading to 6.6-stable and/or migrating to "-o 64bit". However, I cannot be 100% sure if this is a relatively recent regression or not, as I think it does not happen very frequently and usually I don't look at the console during shutdown. The WARNING happens after all filesystems except the root fs (253:0) get unmounted and root is already mounted read-only. Today, I was finally able to capture it with the serial console attached. [ 5802.007527] EXT4-fs (dm-0): re-mounted 5a3b300a-6b1a-4ff1-9138-287dec4dcdd7 ro. Quota mode: none. [ 5803.382293] sd 0:0:7:0: [sdh] Synchronizing SCSI cache [ 5803.388868] sd 0:0:7:0: [sdh] Stopping disk [ 5821.086972] sd 0:0:6:0: [sdg] Synchronizing SCSI cache [ 5821.093581] sd 0:0:6:0: [sdg] Stopping disk [ 5832.944678] ------------[ cut here ]------------ [ 5832.950507] WARNING: CPU: 5 PID: 23226 at fs/ext4/ext4_jbd2.c:73 ext4_journal_check_start+0x2c/0x82 [ 5832.961303] CPU: 5 PID: 23226 Comm: kworker/u16:28 Not tainted 6.6.30-o4 #2 [ 5832.969772] Hardware name: Dell Inc. PowerEdge T330/06FW8M, BIOS 2.20.0 02/22/2024 [ 5832.978872] Workqueue: writeback wb_workfn (flush-253:0) [ 5832.985498] RIP: 0010:ext4_journal_check_start+0x2c/0x82 [ 5832.992079] Code: 89 3c 24 2e 2e 2e 31 c0 48 8b 3c 24 b8 fb ff ff ff 48 8b 97 78 03 00 00 48 8b 8a 30 02 00 00 80 e1 02 75 56 f6 47 50 01 74 04 <0f> 0b eb 47 66 83 bf 50 02 00 00 04 75 00 [ 5833.014495] RSP: 0018:ffffc9000eff7908 EFLAGS: 00010202 [ 5833.021000] RAX: 00000000fffffffb RBX: ffffc9000eff7b18 RCX: 0000000000000000 [ 5833.029711] RDX: ffff8881021f5000 RSI: ffff888100f8c000 RDI: ffff888100f8c000 [ 5833.038392] RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000000 [ 5833.047028] R10: 8080808080808080 R11: fefefefefefefeff R12: ffff888100f8c000 [ 5833.055698] R13: 0000000000000008 R14: 0000000000000959 R15: ffffffff95c7c06f [ 5833.064377] FS: 0000000000000000(0000) GS:ffff889030140000(0000) knlGS:0000000000000000 [ 5833.074106] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5833.081239] CR2: 00007f8bac652120 CR3: 0000000309e44001 CR4: 00000000003706e0 [ 5833.089883] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 5833.098573] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 5833.107255] Call Trace: [ 5833.110693] <TASK> [ 5833.113727] ? __warn+0x93/0x11a [ 5833.117961] ? report_bug+0xeb/0x162 [ 5833.122630] ? ext4_journal_check_start+0x2c/0x82 [ 5833.128636] ? handle_bug+0x3c/0x63 [ 5833.133212] ? exc_invalid_op+0x17/0x64 [ 5833.138176] ? asm_exc_invalid_op+0x1a/0x20 [ 5833.143530] ? __ext4_journal_start+0x15/0x1b [ 5833.149031] ? ext4_journal_check_start+0x2c/0x82 [ 5833.154920] __ext4_journal_start_sb+0xe5/0x152 [ 5833.160753] __ext4_journal_start+0x15/0x1b [ 5833.166046] mpage_prepare_extent_to_map+0xd1/0x38b [ 5833.172142] ext4_do_writepages+0x2a9/0x922 [ 5833.177490] ext4_writepages+0x83/0xda [ 5833.182332] do_writepages+0xca/0x177 [ 5833.187024] ? lock_timer_base+0x3b/0x64 [ 5833.192001] __writeback_single_inode+0x83/0x301 [ 5833.197760] writeback_sb_inodes+0x251/0x418 [ 5833.203168] __writeback_inodes_wb+0x80/0xc8 [ 5833.208574] wb_writeback+0x142/0x266 [ 5833.213307] wb_workfn+0x212/0x3ac [ 5833.217733] ? __raw_spin_unlock_irqrestore+0x14/0x29 [ 5833.223973] process_scheduled_works+0x196/0x29d [ 5833.229723] worker_thread+0x1c5/0x21f [ 5833.234523] ? __pfx_worker_thread+0x10/0x10 [ 5833.239850] kthread+0xf3/0xfe [ 5833.243826] ? __pfx_kthread+0x10/0x10 [ 5833.248633] ret_from_fork+0x20/0x35 [ 5833.253239] ? __pfx_kthread+0x10/0x10 [ 5833.257963] ret_from_fork_asm+0x1b/0x30 [ 5833.262874] </TASK> [ 5833.265828] ---[ end trace 0000000000000000 ]--- [ 5838.780155] sd 0:0:5:0: [sdf] Synchronizing SCSI cache [ 5838.788570] sd 0:0:5:0: [sdf] Stopping disk [ 5856.502606] sd 0:0:4:0: [sde] Synchronizing SCSI cache [ 5856.510119] sd 0:0:4:0: [sde] Stopping disk [ 5874.197657] sd 0:0:3:0: [sdd] Synchronizing SCSI cache [ 5874.204287] sd 0:0:3:0: [sdd] Stopping disk [ 5882.659434] sd 0:0:2:0: [sdc] Synchronizing SCSI cache [ 5882.666164] sd 0:0:2:0: [sdc] Stopping disk [ 5891.129810] sd 0:0:1:0: [sdb] Synchronizing SCSI cache [ 5891.136410] sd 0:0:1:0: [sdb] Stopping disk [ 5899.598645] sd 0:0:0:0: [sda] Synchronizing SCSI cache [ 5899.605233] sd 0:0:0:0: [sda] Stopping disk [ 5908.184767] megaraid_sas 0000:02:00.0: megasas_disable_intr_fusion is called outbound_intr_mask:0x40000009 [ 5908.198623] mlx4_core 0000:01:00.0: mlx4_shutdown was called [ 5908.250311] bond0: (slave eth2): Releasing backup interface [ 5908.257384] bond0: (slave eth2): the permanent HWaddr of slave - XX:XX:XX:XX:XX:XX - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts [ 5908.290793] mlx4_en 0000:01:00.0: removed PHC [ 5908.327539] bond0: (slave eth3): Releasing backup interface [ 5909.421105] ACPI: PM: Preparing to enter system sleep state S5 [ 5909.428720] kvm: exiting hardware virtualization [ 5909.434855] reboot: Power down # tune2fs -l /dev/VG0/root |head -12 tune2fs 1.47.0 (5-Feb-2023) Filesystem volume name: / Last mounted on: / Filesystem UUID: 5a3b300a-6b1a-4ff1-9138-287dec4dcdd7 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index orphan_file filetype needs_recovery extent 64bit flex_bg metadata_csum_seed sparse_super large_file huge_file dir_nlink extra_isize metadata_csum orphan_present Filesystem flags: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Remount read-only Filesystem OS type: Linux # grep /dev/mapper/VG0-root /proc/mounts /dev/mapper/VG0-root / ext4 rw,relatime,nodioread_nolock,nodelalloc,stripe=192,data=journal 0 0 Best regards, Krzysztof Olędzki
