audit: type=1400 audit(1571331055.318:36): avc: denied { map } for pid=7587 comm="syz-executor836" path="/root/syz-executor836664410" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 INFO: task cron:7488 blocked for more than 140 seconds. Not tainted 4.19.79 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. cron D25112 7488 1 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 fuse_lookup+0x8e/0x3e0 fs/fuse/dir.c:360 __lookup_slow+0x279/0x500 fs/namei.c:1671 lookup_slow+0x58/0x80 fs/namei.c:1688 walk_component+0x747/0x2000 fs/namei.c:1810 link_path_walk.part.0+0x980/0x1330 fs/namei.c:2141 link_path_walk fs/namei.c:2269 [inline] path_lookupat.isra.0+0xe3/0x8d0 fs/namei.c:2317 filename_lookup+0x1b0/0x410 fs/namei.c:2348 user_path_at_empty+0x43/0x50 fs/namei.c:2608 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x129/0x200 fs/stat.c:185 vfs_stat include/linux/fs.h:3128 [inline] __do_sys_newstat+0xa4/0x130 fs/stat.c:337 __se_sys_newstat fs/stat.c:333 [inline] __x64_sys_newstat+0x54/0x80 fs/stat.c:333 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb032194c65 Code: Bad RIP value. RSP: 002b:00007ffc2e6dcbd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 00007fb032212aa4 RCX: 00007fb032194c65 RDX: 00007ffc2e6dcc20 RSI: 00007ffc2e6dcc20 RDI: 00007fb032212aa4 RBP: 00007ffc2e6dcd20 R08: 0000000000b70710 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 000000000000002f R15: 0000000000000000 INFO: task syz-executor836:7587 blocked for more than 140 seconds. Not tainted 4.19.79 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor836 D27704 7587 7585 0x00000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 fuse_lookup+0x8e/0x3e0 fs/fuse/dir.c:360 __lookup_slow+0x279/0x500 fs/namei.c:1671 lookup_slow+0x58/0x80 fs/namei.c:1688 walk_component+0x747/0x2000 fs/namei.c:1810 link_path_walk.part.0+0x980/0x1330 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x1f9/0x45e0 fs/namei.c:3533 do_filp_open+0x1a1/0x280 fs/namei.c:3564 do_sys_open+0x3fe/0x550 fs/open.c:1088 __do_sys_open fs/open.c:1106 [inline] __se_sys_open fs/open.c:1101 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1101 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x444c90 Code: 31 c0 e9 45 ff ff ff 0f 1f 00 80 3f 00 0f 84 f7 00 00 00 55 53 b9 02 00 00 00 be 00 08 09 00 89 c8 48 81 ec 98 00 00 00 0f 05 <48> 3d 00 f0 ff ff 48 89 c3 0f 87 e9 00 00 00 85 db 0f 88 2f 01 00 RSP: 002b:00007fff109d8780 EFLAGS: 00000202 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444c90 RDX: 0000000000000000 RSI: 0000000000090800 RDI: 00000000004ae8f6 RBP: 0000000000001da8 R08: 0000000000001da3 R09: 0000000001fb1880 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff109d89b0 R13: 00000000004075c0 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor836:7592 blocked for more than 140 seconds. Not tainted 4.19.79 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor836 D27816 7592 7587 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 fuse_lookup+0x8e/0x3e0 fs/fuse/dir.c:360 __lookup_slow+0x279/0x500 fs/namei.c:1671 lookup_slow+0x58/0x80 fs/namei.c:1688 walk_component+0x747/0x2000 fs/namei.c:1810 link_path_walk.part.0+0x980/0x1330 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x1f9/0x45e0 fs/namei.c:3533 do_filp_open+0x1a1/0x280 fs/namei.c:3564 do_sys_open+0x3fe/0x550 fs/open.c:1088 __do_sys_open fs/open.c:1106 [inline] __se_sys_open fs/open.c:1101 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1101 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x405800 Code: 01 f0 ff ff 0f 83 d0 18 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 2d c3 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 a4 18 00 00 c3 48 83 ec 08 e8 0a fc ff ff RSP: 002b:00007fff109d8488 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fff109d84b4 RCX: 0000000000405800 RDX: 00007fff109d84ba RSI: 0000000000080001 RDI: 00000000004ae914 RBP: 00007fff109d84b0 R08: 0000000000000000 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000407530 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by init/1: #0: 000000000aded856 (&type->i_mutex_dir_key#6){++++}, at: inode_lock_shared include/linux/fs.h:757 [inline] #0: 000000000aded856 (&type->i_mutex_dir_key#6){++++}, at: lookup_slow+0x4a/0x80 fs/namei.c:1687 #1: 0000000089b5410d (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 1 lock held by khungtaskd/1037: #0: 000000001511d4c4 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 1 lock held by rsyslogd/7436: #0: 0000000082732f77 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by cron/7488: #0: 000000000aded856 (&type->i_mutex_dir_key#6){++++}, at: inode_lock_shared include/linux/fs.h:757 [inline] #0: 000000000aded856 (&type->i_mutex_dir_key#6){++++}, at: lookup_slow+0x4a/0x80 fs/namei.c:1687 #1: 0000000089b5410d (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 2 locks held by getty/7559: #0: 00000000a81d4d1b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000bea97ad6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7560: #0: 00000000cbc19dca (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000005f595974 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7561: #0: 00000000f29faa95 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000008a873cdb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7562: #0: 00000000de76f3b9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000755b1008 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7563: #0: 00000000679a388a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000058b349ca (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7564: #0: 0000000062334e40 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000037e28a2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7565: #0: 0000000008eb0ebd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000cb6959e7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by syz-executor836/7587: #0: 000000000aded856 (&type->i_mutex_dir_key#6){++++}, at: inode_lock_shared include/linux/fs.h:757 [inline] #0: 000000000aded856 (&type->i_mutex_dir_key#6){++++}, at: lookup_slow+0x4a/0x80 fs/namei.c:1687 #1: 0000000089b5410d (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 2 locks held by syz-executor836/7592: #0: 000000000aded856 (&type->i_mutex_dir_key#6){++++}, at: inode_lock_shared include/linux/fs.h:757 [inline] #0: 000000000aded856 (&type->i_mutex_dir_key#6){++++}, at: lookup_slow+0x4a/0x80 fs/namei.c:1687 #1: 0000000089b5410d (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1037 Comm: khungtaskd Not tainted 4.19.79 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60