Out of memory (oom_kill_allocating_task): Killed process 176 (rsyslogd) total-vm:220876kB, anon-rss:1332kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:76kB oom_score_adj:0 ====================================================== WARNING: possible circular locking dependency detected 5.10.123 #1 Not tainted ------------------------------------------------------ kswapd0/56 is trying to acquire lock: ffff88800f9808e0 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xf94/0x1390 fs/jbd2/transaction.c:449 but task is already holding lock: ffffffff84e90c40 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x0/0x30 include/linux/mm.h:907 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:4298 [inline] fs_reclaim_acquire+0xc1/0xf0 mm/page_alloc.c:4309 slab_pre_alloc_hook mm/slab.h:510 [inline] slab_alloc_node mm/slub.c:2821 [inline] __kmalloc_node+0x5c/0x4a0 mm/slub.c:4015 kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x115/0x170 mm/util.c:607 kvmalloc include/linux/mm.h:765 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1465 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1508 [inline] ext4_xattr_set_entry+0x1e12/0x3850 fs/ext4/xattr.c:1649 ext4_xattr_ibody_set+0x78/0x2b0 fs/ext4/xattr.c:2225 ext4_xattr_set_handle+0x947/0x1310 fs/ext4/xattr.c:2382 ext4_xattr_set+0x13a/0x340 fs/ext4/xattr.c:2495 __vfs_setxattr+0x10f/0x170 fs/xattr.c:177 __vfs_setxattr_noperm+0x11a/0x4c0 fs/xattr.c:208 __vfs_setxattr_locked+0x1bf/0x250 fs/xattr.c:266 vfs_setxattr+0xe8/0x270 fs/xattr.c:283 setxattr+0x23d/0x330 fs/xattr.c:548 path_setxattr+0x170/0x190 fs/xattr.c:567 __do_sys_setxattr fs/xattr.c:582 [inline] __se_sys_setxattr fs/xattr.c:578 [inline] __x64_sys_setxattr+0xc0/0x160 fs/xattr.c:578 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #1 (&ei->xattr_sem){++++}-{3:3}: down_write+0x92/0x150 kernel/locking/rwsem.c:1557 ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline] ext4_xattr_set_handle+0x15e/0x1310 fs/ext4/xattr.c:2309 ext4_initxattrs+0xb5/0x120 fs/ext4/xattr_security.c:43 security_inode_init_security+0x1a7/0x350 security/security.c:1069 __ext4_new_inode+0x383b/0x5400 fs/ext4/ialloc.c:1319 ext4_create+0x2ce/0x4d0 fs/ext4/namei.c:2647 lookup_open.isra.0+0xe6b/0x1230 fs/namei.c:3099 open_last_lookups fs/namei.c:3169 [inline] path_openat+0x961/0x26c0 fs/namei.c:3357 do_filp_open+0x17e/0x3c0 fs/namei.c:3387 do_sys_openat2+0x16d/0x420 fs/open.c:1180 do_sys_open fs/open.c:1196 [inline] __do_sys_openat fs/open.c:1212 [inline] __se_sys_openat fs/open.c:1207 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1207 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #0 (jbd2_handle){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:2988 [inline] check_prevs_add kernel/locking/lockdep.c:3113 [inline] validate_chain kernel/locking/lockdep.c:3728 [inline] __lock_acquire+0x29e3/0x5b00 kernel/locking/lockdep.c:4954 lock_acquire kernel/locking/lockdep.c:5564 [inline] lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5529 start_this_handle+0xfc7/0x1390 fs/jbd2/transaction.c:451 jbd2__journal_start+0x38c/0x880 fs/jbd2/transaction.c:508 __ext4_journal_start_sb+0x210/0x420 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:328 [inline] ext4_dirty_inode+0xbc/0x130 fs/ext4/inode.c:6002 __mark_inode_dirty+0x492/0xf10 fs/fs-writeback.c:2249 mark_inode_dirty_sync include/linux/fs.h:2188 [inline] iput.part.0+0x57/0x780 fs/inode.c:1679 iput+0x58/0x70 fs/inode.c:1672 dentry_unlink_inode+0x2b4/0x3e0 fs/dcache.c:374 __dentry_kill+0x36f/0x5c0 fs/dcache.c:579 shrink_dentry_list+0x12f/0x4a0 fs/dcache.c:1141 prune_dcache_sb+0xe7/0x140 fs/dcache.c:1222 super_cache_scan+0x331/0x580 fs/super.c:105 do_shrink_slab+0x3bc/0x8d0 mm/vmscan.c:516 shrink_slab_memcg mm/vmscan.c:586 [inline] shrink_slab+0x384/0x5f0 mm/vmscan.c:665 shrink_node_memcgs mm/vmscan.c:2665 [inline] shrink_node+0x8a7/0x1cf0 mm/vmscan.c:2780 kswapd_shrink_node mm/vmscan.c:3523 [inline] balance_pgdat+0x71e/0x11a0 mm/vmscan.c:3681 kswapd+0x58c/0xc80 mm/vmscan.c:3938 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:296 other info that might help us debug this: Chain exists of: jbd2_handle --> &ei->xattr_sem --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&ei->xattr_sem); lock(fs_reclaim); lock(jbd2_handle); *** DEADLOCK *** 3 locks held by kswapd0/56: #0: ffffffff84e90c40 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x0/0x30 include/linux/mm.h:907 #1: ffffffff84e6d410 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab_memcg mm/vmscan.c:558 [inline] #1: ffffffff84e6d410 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x29c/0x5f0 mm/vmscan.c:665 #2: ffff88800f95c0e0 (&type->s_umount_key#42){++++}-{3:3}, at: trylock_super fs/super.c:418 [inline] #2: ffff88800f95c0e0 (&type->s_umount_key#42){++++}-{3:3}, at: super_cache_scan+0x71/0x580 fs/super.c:80 stack backtrace: CPU: 1 PID: 56 Comm: kswapd0 Not tainted 5.10.123 #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 lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2123 check_prev_add kernel/locking/lockdep.c:2988 [inline] check_prevs_add kernel/locking/lockdep.c:3113 [inline] validate_chain kernel/locking/lockdep.c:3728 [inline] __lock_acquire+0x29e3/0x5b00 kernel/locking/lockdep.c:4954 lock_acquire kernel/locking/lockdep.c:5564 [inline] lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5529 start_this_handle+0xfc7/0x1390 fs/jbd2/transaction.c:451 jbd2__journal_start+0x38c/0x880 fs/jbd2/transaction.c:508 __ext4_journal_start_sb+0x210/0x420 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:328 [inline] ext4_dirty_inode+0xbc/0x130 fs/ext4/inode.c:6002 __mark_inode_dirty+0x492/0xf10 fs/fs-writeback.c:2249 mark_inode_dirty_sync include/linux/fs.h:2188 [inline] iput.part.0+0x57/0x780 fs/inode.c:1679 iput+0x58/0x70 fs/inode.c:1672 dentry_unlink_inode+0x2b4/0x3e0 fs/dcache.c:374 __dentry_kill+0x36f/0x5c0 fs/dcache.c:579 shrink_dentry_list+0x12f/0x4a0 fs/dcache.c:1141 prune_dcache_sb+0xe7/0x140 fs/dcache.c:1222 super_cache_scan+0x331/0x580 fs/super.c:105 do_shrink_slab+0x3bc/0x8d0 mm/vmscan.c:516 shrink_slab_memcg mm/vmscan.c:586 [inline] shrink_slab+0x384/0x5f0 mm/vmscan.c:665 shrink_node_memcgs mm/vmscan.c:2665 [inline] shrink_node+0x8a7/0x1cf0 mm/vmscan.c:2780 kswapd_shrink_node mm/vmscan.c:3523 [inline] balance_pgdat+0x71e/0x11a0 mm/vmscan.c:3681 kswapd+0x58c/0xc80 mm/vmscan.c:3938 kthread+0x38f/0x470 kernel/kthread.c:313 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:296 systemd[1]: systemd-journald.service: Main process exited, code=killed, status=6/ABRT systemd[1]: systemd-journald.service: Failed with result 'watchdog'. systemd[1]: systemd-journald.service: Consumed 27.553s CPU time. systemd[1]: systemd-journald.service: Scheduled restart job, restart counter is at 1. systemd[1]: Stopping Flush Journal to Persistent Storage... systemd[1]: Started System Logging Service. 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.