INFO: task syz-executor.0:19119 blocked for more than 143 seconds. Not tainted 5.11.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27768 pid:19119 ppid: 8414 flags:0x20004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2198 do_new_mount_fc fs/namespace.c:2824 [inline] do_new_mount fs/namespace.c:2883 [inline] path_mount+0x1787/0x20c0 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount fs/namespace.c:3409 [inline] __ia32_sys_mount+0x27e/0x300 fs/namespace.c:3409 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f76549 RSP: 002b:00000000f554f5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000200042c0 RDX: 0000000020002000 RSI: 0000000000000000 RDI: 0000000020002440 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1647: #0: ffffffff8bf743e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8081: #0: ffff8880210aa370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 3 locks held by syz-executor.0/19116: 1 lock held by syz-executor.0/19119: #0: ffff888032ba8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff888032ba8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2198 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1647 Comm: khungtaskd Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd48/0xfb0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4808 Comm: systemd-journal Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mark_lock+0x151/0x17b0 kernel/locking/lockdep.c:4439 Code: 12 00 00 48 89 ee 48 23 70 50 41 ba 01 00 00 00 0f 84 79 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 43 08 00 00 00 00 48 c7 43 10 00 00 00 00 48 8b 84 24 10 01 00 RSP: 0018:ffffc9000132fa38 EFLAGS: 00000086 RAX: dffffc0000000000 RBX: fffff52000265f4e RCX: 1ffffffff1f558ca RDX: dffffc0000000000 RSI: 0000000000000040 RDI: ffffffff8faac650 RBP: 0000000000000040 R08: 0000000000000000 R09: ffffffff8faa47b7 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000006 R13: ffff888011fb2570 R14: 00000000000000a3 R15: ffff888011fb2590 FS: 00007fb5f7e478c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb5f5315018 CR3: 0000000011d5a000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_usage kernel/locking/lockdep.c:4391 [inline] __lock_acquire+0x885/0x54c0 kernel/locking/lockdep.c:4854 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475 fs_reclaim_acquire mm/page_alloc.c:4343 [inline] fs_reclaim_acquire+0xd2/0x150 mm/page_alloc.c:4334 might_alloc include/linux/sched/mm.h:193 [inline] slab_pre_alloc_hook mm/slab.h:493 [inline] slab_alloc_node mm/slub.c:2817 [inline] slab_alloc mm/slub.c:2900 [inline] __kmalloc+0x58/0x3f0 mm/slub.c:4021 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:684 [inline] lsm_cred_alloc security/security.c:534 [inline] security_prepare_creds+0x10e/0x190 security/security.c:1641 prepare_creds+0x509/0x730 kernel/cred.c:285 access_override_creds fs/open.c:353 [inline] do_faccessat+0x3d7/0x820 fs/open.c:417 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb5f71029c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffdbba716a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffdbba745c0 RCX: 00007fb5f71029c7 RDX: 00007fb5f7b73a00 RSI: 0000000000000000 RDI: 00005632bcaf29a3 RBP: 00007ffdbba716e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffdbba745c0 R15: 00007ffdbba71bd0