IPVS: ftp: loaded support on port[0] = 21 INFO: task segctord:15411 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. segctord D30128 15411 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 nilfs_transaction_lock+0x1fb/0x8b0 fs/nilfs2/segment.c:362 IPVS: ftp: loaded support on port[0] = 21 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2479 [inline] nilfs_segctor_thread+0x3c0/0xf50 fs/nilfs2/segment.c:2563 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 2 locks held by kworker/u4:0/7: 1 lock held by khungtaskd/1570: #0: 0000000079bae219 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by systemd-udevd/4695: 1 lock held by in:imklog/7808: #0: 00000000e599eb96 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.0/8131: #0: 000000000942463f (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: 000000000942463f (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x256/0x6f0 kernel/rcu/tree_exp.h:667 3 locks held by kworker/u4:6/8863: 2 locks held by login/11966: #0: 000000009b9e49a8 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000d51ae473 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 7 locks held by syz-executor.1/15406: 1 lock held by segctord/15411: #0: 0000000029e82221 (&nilfs->ns_segctor_sem){++++}, at: nilfs_transaction_lock+0x1fb/0x8b0 fs/nilfs2/segment.c:362 2 locks held by syz-executor.3/20430: #0: 0000000072dd96ea (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 0000000072dd96ea (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:598 #1: 000000000942463f (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #1: 000000000942463f (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 15406 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:100 Code: e8 11 dd 35 00 e9 ab fe ff ff 4c 89 ef e8 04 dd 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 <65> 48 8b 04 25 c0 df 01 00 65 8b 15 cc 59 9f 7e 81 e2 00 01 1f 00 RSP: 0018:ffff888058e16de8 EFLAGS: 00000002 RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff8167a95d RDX: 0000000000000001 RSI: ffffffff8167a966 RDI: 0000000000000005 RBP: 0000000000600040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff888094c187c0 R13: ffff88823967b600 R14: ffff88823967b600 R15: 0000000000000286 FS: 00007ff2c06a1700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcc6e8f258 CR3: 0000000095463000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: preempt_count arch/x86/include/asm/preempt.h:23 [inline] trace_hardirqs_on+0x26/0x210 kernel/trace/trace_preemptirq.c:24 slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x2b1/0x370 mm/slab.c:3557 nilfs_btree_alloc_path+0x3b/0x180 fs/nilfs2/btree.c:28 nilfs_btree_lookup+0x1f/0x110 fs/nilfs2/btree.c:680 nilfs_bmap_lookup_at_level+0xcd/0x3e0 fs/nilfs2/bmap.c:69 nilfs_bmap_lookup fs/nilfs2/bmap.h:170 [inline] nilfs_mdt_submit_block.constprop.0+0x1a5/0xaa0 fs/nilfs2/mdt.c:142 nilfs_mdt_read_block+0x96/0x3e0 fs/nilfs2/mdt.c:175 nilfs_mdt_get_block+0xe6/0xd40 fs/nilfs2/mdt.c:250 nilfs_palloc_get_block+0xc4/0x2b0 fs/nilfs2/alloc.c:216 nilfs_palloc_get_entry_block+0x17b/0x230 fs/nilfs2/alloc.c:318 nilfs_dat_translate+0x7e/0x480 fs/nilfs2/dat.c:391 nilfs_bmap_lookup_at_level+0x237/0x3e0 fs/nilfs2/bmap.c:75 nilfs_bmap_lookup fs/nilfs2/bmap.h:170 [inline] nilfs_mdt_submit_block.constprop.0+0x1a5/0xaa0 fs/nilfs2/mdt.c:142 nilfs_mdt_read_block+0x96/0x3e0 fs/nilfs2/mdt.c:175 nilfs_mdt_get_block+0xe6/0xd40 fs/nilfs2/mdt.c:250 nilfs_palloc_get_block+0xc4/0x2b0 fs/nilfs2/alloc.c:216 nilfs_palloc_get_entry_block+0x17b/0x230 fs/nilfs2/alloc.c:318 nilfs_ifile_create_inode+0xea/0x240 fs/nilfs2/ifile.c:66 nilfs_new_inode+0x1dc/0x760 fs/nilfs2/inode.c:353 nilfs_create fs/nilfs2/namei.c:85 [inline] nilfs_create+0xfe/0x2f0 fs/nilfs2/namei.c:75 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff2c212e639 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff2c06a1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007ff2c224ef80 RCX: 00007ff2c212e639 RDX: 000000000000275a RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007ff2c2189ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe5c03ea3f R14: 00007ff2c06a1300 R15: 0000000000022000