INFO: task syz-executor.0:31688 blocked for more than 143 seconds. Not tainted 5.5.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28120 31688 9087 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121 blk_trace_ioctl+0xe3/0x300 kernel/trace/blktrace.c:704 blkdev_ioctl+0x126/0x1df0 block/ioctl.c:568 block_ioctl+0xee/0x130 fs/block_dev.c:1983 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a6f9 Code: Bad RIP value. RSP: 002b:00007f2c20980c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a6f9 RDX: 0000000020000080 RSI: 00000000c0481273 RDI: 0000000000000005 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2c209816d4 R13: 00000000004c20c3 R14: 00000000004d71e8 R15: 00000000ffffffff Showing all locks held in the system: 3 locks held by init/1: #0: ffff8880a1e762e8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 fs/ext4/inode.c:5976 #1: ffff8880ae937358 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #1: ffff8880ae937358 (&rq->lock){-.-.}, at: __schedule+0x232/0x1f90 kernel/sched/core.c:4029 #2: ffffffff899a56c0 (rcu_read_lock){....}, at: mem_cgroup_iter+0x101/0x5f0 mm/memcontrol.c:1011 1 lock held by khungtaskd/1096: #0: ffffffff899a56c0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334 1 lock held by rsyslogd/8958: 2 locks held by cron/8998: 2 locks held by getty/9048: #0: ffff8880a7dbc090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000178b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9049: #0: ffff8880a95d5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9050: #0: ffff8880a93de090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900017cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9051: #0: ffff88809f555090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900017db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9052: #0: ffff8880a758b090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000175b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9053: #0: ffff8880a009f090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000176b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9054: #0: ffff8880a0531090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000172b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 4 locks held by syz-fuzzer/9072: 3 locks held by syz-fuzzer/9085: 3 locks held by syz-fuzzer/8591: 1 lock held by syz-executor.0/31688: #0: ffff8880a219d638 (&q->blk_trace_mutex){+.+.}, at: blk_trace_ioctl+0xe3/0x300 kernel/trace/blktrace.c:704 5 locks held by syz-executor.5/31479: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1096 Comm: khungtaskd Not tainted 5.5.0-rc1-syzkaller #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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:205 [inline] watchdog+0xb11/0x10c0 kernel/hung_task.c:289 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9085 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_memory_region+0x1d/0x1a0 mm/kasan/generic.c:191 Code: 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 48 85 f6 0f 84 34 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 55 0f b6 d2 48 39 c7 48 89 e5 <41> 55 41 54 53 0f 86 07 01 00 00 4c 8d 5c 37 ff 49 89 f8 48 b8 00 RSP: 0000:ffffc90001e87188 EFLAGS: 00000216 RAX: ffff7fffffffffff RBX: 0000000000000000 RCX: ffffffff81ff4a7c RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8a799980 RBP: ffffc90001e87188 R08: ffff888090aca600 R09: ffff888090acae90 R10: fffffbfff14f3330 R11: ffffffff8a799987 R12: 0000000000000000 R13: ffffc90001e872d0 R14: ffff8880996ea5a0 R15: 0000000000000080 FS: 000000c42008a768(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc587b93e16 CR3: 00000000a4b40000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __kasan_check_read+0x11/0x20 mm/kasan/common.c:95 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] cpumask_test_cpu include/linux/cpumask.h:360 [inline] trace_ext4_es_shrink_count include/trace/events/ext4.h:2446 [inline] ext4_es_count+0x9c/0x3c0 fs/ext4/extents_status.c:1541 do_shrink_slab+0x109/0xad0 mm/vmscan.c:444 shrink_slab mm/vmscan.c:687 [inline] shrink_slab+0x19a/0x680 mm/vmscan.c:660 shrink_node_memcgs mm/vmscan.c:2687 [inline] shrink_node+0x46a/0x1ad0 mm/vmscan.c:2791 shrink_zones mm/vmscan.c:2996 [inline] do_try_to_free_pages+0x3ba/0x14f0 mm/vmscan.c:3049 try_to_free_pages+0x2dc/0x970 mm/vmscan.c:3288 __perform_reclaim mm/page_alloc.c:4124 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4145 [inline] __alloc_pages_slowpath+0x983/0x2920 mm/page_alloc.c:4562 __alloc_pages_nodemask+0x646/0x910 mm/page_alloc.c:4776 alloc_pages_current+0x107/0x210 mm/mempolicy.c:2207 alloc_pages include/linux/gfp.h:532 [inline] __page_cache_alloc+0x29d/0x490 mm/filemap.c:981 pagecache_get_page+0x27e/0x9e0 mm/filemap.c:1671 filemap_fault+0x9b1/0x3180 mm/filemap.c:2510 ext4_filemap_fault+0x86/0xb2 fs/ext4/inode.c:5977 __do_fault+0x111/0x540 mm/memory.c:3188 do_read_fault mm/memory.c:3585 [inline] do_fault mm/memory.c:3714 [inline] handle_pte_fault mm/memory.c:3945 [inline] __handle_mm_fault+0x2943/0x3da0 mm/memory.c:4075 handle_mm_fault+0x3b2/0xa50 mm/memory.c:4112 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline] __do_page_fault+0x536/0xd80 arch/x86/mm/fault.c:1506 do_page_fault+0x38/0x590 arch/x86/mm/fault.c:1530 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203 RIP: 0033:0x459f50 Code: Bad RIP value. RSP: 002b:000000c42f89ba90 EFLAGS: 00010213 RAX: 000000c4203bc120 RBX: 0000000000000000 RCX: 000000c420000180 RDX: 0000026a0d9d20d4 RSI: 3f742e72ec966f2f RDI: 00007ffe2aded080 RBP: 000000c42f89bc00 R08: 00007ffe2aded090 R09: 0000000000084082 R10: 000000c42f89b9e8 R11: 000000c42f89b9e0 R12: 000000c42f89bb98 R13: 000000c42f89bb98 R14: 0000000000000000 R15: 0000000000000000