INFO: task syz-executor.5:27780 can't die for more than 143 seconds. task:syz-executor.5 state:D stack:27304 pid:27780 ppid: 13343 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4373 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5124 schedule+0xcf/0x270 kernel/sched/core.c:5203 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+0x132/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2204 do_new_mount_fc fs/namespace.c:2832 [inline] do_new_mount fs/namespace.c:2891 [inline] path_mount+0x1678/0x1e70 fs/namespace.c:3220 do_mount fs/namespace.c:3233 [inline] __do_sys_mount fs/namespace.c:3441 [inline] __se_sys_mount fs/namespace.c:3418 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3418 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f4e96e44c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119bfd0 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff6cefb39f R14: 00007f4e96e459c0 R15: 000000000119bf8c INFO: task syz-executor.5:27780 blocked for more than 143 seconds. Not tainted 5.11.0-rc4-next-20210119-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:27304 pid:27780 ppid: 13343 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4373 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5124 schedule+0xcf/0x270 kernel/sched/core.c:5203 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+0x132/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2204 do_new_mount_fc fs/namespace.c:2832 [inline] do_new_mount fs/namespace.c:2891 [inline] path_mount+0x1678/0x1e70 fs/namespace.c:3220 do_mount fs/namespace.c:3233 [inline] __do_sys_mount fs/namespace.c:3441 [inline] __se_sys_mount fs/namespace.c:3418 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3418 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f4e96e44c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119bfd0 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff6cefb39f R14: 00007f4e96e459c0 R15: 000000000119bf8c INFO: task syz-executor.5:27790 can't die for more than 144 seconds. task:syz-executor.5 state:R running task stack:27160 pid:27790 ppid: 13343 flags:0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1665: #0: ffffffff8b370da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6326 2 locks held by kworker/0:3/3177: #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246 #1: ffff8880b9e20088 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 1 lock held by in:imklog/8163: #0: ffff8880133bc0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 4 locks held by kworker/1:4/9804: #0: ffff8880b9f34fd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1322 [inline] #0: ffff8880b9f34fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 kernel/sched/core.c:5041 #1: ffff8880b9f20088 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833 #2: ffff8880b9f24730 (krc.lock){..-.}-{2:2}, at: kfree_rcu_monitor+0x15/0x80 kernel/rcu/tree.c:3410 #3: ffff8880b9f24918 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:944 1 lock held by syz-executor.5/27780: #0: ffff888031f11c50 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff888031f11c50 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2204 2 locks held by syz-executor.5/27790: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1665 Comm: khungtaskd Not tainted 5.11.0-rc4-next-20210119-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+0x107/0x163 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:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4868 Comm: systemd-journal Not tainted 5.11.0-rc4-next-20210119-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:aa_current_raw_label security/apparmor/include/cred.h:89 [inline] RIP: 0010:__begin_current_label_crit_section security/apparmor/include/cred.h:140 [inline] RIP: 0010:common_file_perm security/apparmor/lsm.c:465 [inline] RIP: 0010:apparmor_file_permission+0xa2/0x4e0 security/apparmor/lsm.c:480 Code: ff df 65 48 8b 1c 25 00 f0 01 00 48 8d bb 48 07 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 ec 03 00 00 48 8b 9b 48 07 00 00 <48> b8 00 00 00 00 00 fc ff df 48 8d bb 88 00 00 00 48 89 fa 48 c1 RSP: 0018:ffffc9000163fdb8 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff8880120a2e00 RCX: 0000000000000000 RDX: 1ffff110022dab69 RSI: ffffffff838e0abb RDI: ffff8880116d5b48 RBP: 0000000000000004 R08: 0000000000000000 R09: ffff888025e55a43 R10: ffffffff81c0bff6 R11: 0000000000000000 R12: ffff888012275b80 R13: 0000000000000004 R14: dffffc0000000000 R15: 0000000000000001 FS: 00007f707557c8c0(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7072aea008 CR3: 000000002632b000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: security_file_permission+0x56/0x560 security/security.c:1456 rw_verify_area+0x115/0x350 fs/read_write.c:400 vfs_read+0x126/0x570 fs/read_write.c:487 ksys_read+0x12d/0x250 fs/read_write.c:634 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f7074b0c210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007fffaf373588 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fffaf376000 RCX: 00007f7074b0c210 RDX: 0000000000002000 RSI: 00007fffaf373e00 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000008 R09: 00005582fa65f7b8 R10: 00005582fa65f780 R11: 0000000000000246 R12: 00007fffaf373e00 R13: 00007fffaf375f58 R14: 00005582fa526958 R15: 0005b9434153e8d2