INFO: task syz-executor.1:24554 blocked for more than 140 seconds. Not tainted 5.0.0-rc7+ #81 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29520 24554 7382 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3485 schedule+0x92/0x180 kernel/sched/core.c:3529 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:287 [inline] rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:304 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0x90 kernel/locking/rwsem.c:26 __get_super.part.0+0x203/0x2e0 fs/super.c:699 __get_super include/linux/spinlock.h:329 [inline] __get_super_thawed+0x13a/0x2d0 fs/super.c:736 get_super_thawed+0x18/0x20 fs/super.c:760 quotactl_block fs/quota/quota.c:818 [inline] kernel_quotactl+0x1e8/0x13d0 fs/quota/quota.c:872 __do_sys_quotactl fs/quota/quota.c:893 [inline] __se_sys_quotactl fs/quota/quota.c:890 [inline] __x64_sys_quotactl+0x97/0xf0 fs/quota/quota.c:890 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8d0e3edc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457e29 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8d0e3ee6d4 R13: 00000000004c4a45 R14: 00000000004d8398 R15: 00000000ffffffff INFO: task syz-executor.1:24561 blocked for more than 140 seconds. Not tainted 5.0.0-rc7+ #81 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28096 24561 7382 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3485 schedule+0x92/0x180 kernel/sched/core.c:3529 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:584 [inline] rwsem_down_write_failed+0x774/0xc30 kernel/locking/rwsem-xadd.c:613 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 grab_super+0xaf/0x2c0 fs/super.c:384 sget_userns+0x35a/0xd30 fs/super.c:512 sget+0x10c/0x150 fs/super.c:571 mount_bdev+0xff/0x3c0 fs/super.c:1132 udf_mount+0x35/0x40 fs/udf/super.c:131 mount_fs+0x106/0x3ff fs/super.c:1258 vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:959 vfs_kern_mount fs/namespace.c:949 [inline] do_new_mount fs/namespace.c:2513 [inline] do_mount+0x581/0x2d30 fs/namespace.c:2847 ksys_mount+0xdb/0x150 fs/namespace.c:3063 __do_sys_mount fs/namespace.c:3077 [inline] __se_sys_mount fs/namespace.c:3074 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3074 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: Bad RIP value. RSP: 002b:00007f8d0e3ccc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457e29 RDX: 0000000020000100 RSI: 0000000020000080 RDI: 00000000200002c0 RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8d0e3cd6d4 R13: 00000000004c3bf7 R14: 00000000004d6d60 R15: 00000000ffffffff INFO: task syz-executor.1:24676 blocked for more than 140 seconds. Not tainted 5.0.0-rc7+ #81 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29728 24676 7382 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3485 schedule+0x92/0x180 kernel/sched/core.c:3529 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:287 [inline] rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:304 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0x90 kernel/locking/rwsem.c:26 __get_super.part.0+0x203/0x2e0 fs/super.c:699 __get_super include/linux/spinlock.h:329 [inline] __get_super_thawed+0x13a/0x2d0 fs/super.c:736 get_super_thawed+0x18/0x20 fs/super.c:760 quotactl_block fs/quota/quota.c:818 [inline] kernel_quotactl+0x1e8/0x13d0 fs/quota/quota.c:872 __do_sys_quotactl fs/quota/quota.c:893 [inline] __se_sys_quotactl fs/quota/quota.c:890 [inline] __x64_sys_quotactl+0x97/0xf0 fs/quota/quota.c:890 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8d0e3abc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457e29 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 000000000073c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8d0e3ac6d4 R13: 00000000004c4a45 R14: 00000000004d8398 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1040: #0: 000000005c7c9b10 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/7737: #0: 0000000032be9542 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:795 2 locks held by getty/7849: #0: 000000008aca31c2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000088da9492 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7850: #0: 000000003c0ca4fc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000afb46818 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7851: #0: 00000000122aa1a4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000004b9d3217 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7852: #0: 00000000a527db72 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000055ead604 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7853: #0: 00000000275b0be1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000053130465 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7854: #0: 000000009f242053 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c597e5f7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7855: #0: 00000000476d2c7a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000053fbe159 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 1 lock held by syz-executor.1/24544: 1 lock held by syz-executor.1/24554: #0: 00000000ebde3691 (&type->s_umount_key#85){++++}, at: __get_super.part.0+0x203/0x2e0 fs/super.c:699 2 locks held by syz-executor.1/24561: #0: 000000009b820955 (&bdev->bd_fsfreeze_mutex){+.+.}, at: mount_bdev+0x93/0x3c0 fs/super.c:1126 #1: 00000000ebde3691 (&type->s_umount_key#85){++++}, at: grab_super+0xaf/0x2c0 fs/super.c:384 1 lock held by syz-executor.1/24676: #0: 00000000ebde3691 (&type->s_umount_key#85){++++}, at: __get_super.part.0+0x203/0x2e0 fs/super.c:699 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc7+ #81 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+0x1be/0x236 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+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 24544 Comm: syz-executor.1 Not tainted 5.0.0-rc7+ #81 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x50 kernel/kcov.c:106 Code: 65 8b 15 38 0c 92 7e 81 e2 00 01 1f 00 75 2b 8b 90 d8 12 00 00 83 fa 02 75 20 48 8b 88 e0 12 00 00 8b 80 dc 12 00 00 48 8b 11 <48> 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 RSP: 0018:ffff888085f87570 EFLAGS: 00000046 RAX: 0000000000040000 RBX: ffff888095a7b9d8 RCX: ffffc90006fe9000 RDX: 000000000003ffff RSI: ffffffff832b078c RDI: ffffffff87a24280 RBP: ffff888085f87570 R08: ffff888085ef8580 R09: fffff9400040ebf7 R10: fffff9400040ebf6 R11: ffffea0002075fb7 R12: ffffffff87a24280 R13: 0000000000000200 R14: ffffffff8775fe60 R15: 0000000000000004 FS: 00007f8d0e40f700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c42dec1000 CR3: 000000008e1da000 CR4: 00000000001406e0 Call Trace: check_preemption_disabled+0x1c/0x290 lib/smp_processor_id.c:13 __this_cpu_preempt_check+0x1d/0x30 lib/smp_processor_id.c:62 lookup_bh_lru fs/buffer.c:1262 [inline] __find_get_block+0xfa/0xcf0 fs/buffer.c:1291 __getblk_slow fs/buffer.c:1040 [inline] __getblk_gfp+0x1b1/0x960 fs/buffer.c:1321 __bread_gfp+0x2f/0x300 fs/buffer.c:1355 sb_bread include/linux/buffer_head.h:307 [inline] udf_tread+0xf1/0x140 fs/udf/misc.c:44 udf_read_tagged+0x50/0x530 fs/udf/misc.c:210 udf_check_anchor_block+0x1ef/0x680 fs/udf/super.c:1775 udf_scan_anchors+0x4dd/0x680 fs/udf/super.c:1854 udf_find_anchor fs/udf/super.c:1872 [inline] udf_load_vrs+0x67f/0xc80 fs/udf/super.c:1937 udf_fill_super+0x7d8/0x16d1 fs/udf/super.c:2132 mount_bdev+0x307/0x3c0 fs/super.c:1159 udf_mount+0x35/0x40 fs/udf/super.c:131 mount_fs+0x106/0x3ff fs/super.c:1258 vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:959 vfs_kern_mount fs/namespace.c:949 [inline] do_new_mount fs/namespace.c:2513 [inline] do_mount+0x581/0x2d30 fs/namespace.c:2847 ksys_mount+0xdb/0x150 fs/namespace.c:3063 __do_sys_mount fs/namespace.c:3077 [inline] __se_sys_mount fs/namespace.c:3074 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3074 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8d0e40ec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457e29 RDX: 0000000020000100 RSI: 0000000020000080 RDI: 00000000200002c0 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8d0e40f6d4 R13: 00000000004c3bf7 R14: 00000000004d6d60 R15: 00000000ffffffff