INFO: task systemd-udevd:8930 blocked for more than 143 seconds. Not tainted 5.8.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D27032 8930 3915 0x00004100 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8a9/0x19d0 kernel/sched/core.c:4155 schedule+0xc4/0x2b0 kernel/sched/core.c:4230 io_schedule+0x17/0x60 kernel/sched/core.c:5873 wait_on_page_bit_common+0x2bb/0xa10 mm/filemap.c:1150 wait_on_page_bit mm/filemap.c:1199 [inline] wait_on_page_locked include/linux/pagemap.h:568 [inline] wait_on_page_read mm/filemap.c:2729 [inline] do_read_cache_page+0x436/0x960 mm/filemap.c:2772 read_mapping_page include/linux/pagemap.h:437 [inline] read_part_sector+0xd8/0x486 block/partitions/core.c:772 adfspart_check_ICS+0x92/0xb80 block/partitions/acorn.c:360 check_partition block/partitions/core.c:140 [inline] blk_add_partitions+0x396/0xc70 block/partitions/core.c:700 bdev_disk_changed+0x171/0x290 fs/block_dev.c:1524 __blkdev_get+0xbb5/0x1150 fs/block_dev.c:1662 blkdev_get+0x1aa/0x260 fs/block_dev.c:1728 do_dentry_open+0x436/0x1030 fs/open.c:828 do_open fs/namei.c:3243 [inline] path_openat+0xd1a/0x21e0 fs/namei.c:3360 do_filp_open+0x171/0x240 fs/namei.c:3387 do_sys_openat2+0x2dc/0x500 fs/open.c:1179 do_sys_open+0x85/0xd0 fs/open.c:1195 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f0104bde840 Code: Bad RIP value. RSP: 002b:00007ffe6fe28bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055647bf602f0 RCX: 00007f0104bde840 RDX: 000055647a8e3fe3 RSI: 00000000000a0800 RDI: 000055647bf598d0 RBP: 00007ffe6fe28d50 R08: 000055647a8e3670 R09: 0000000000000010 R10: 000055647a8e3d0c R11: 0000000000000246 R12: 00007ffe6fe28ca0 R13: 000055647bf61ff0 R14: 0000000000000003 R15: 000000000000000e INFO: task syz-executor.2:14980 blocked for more than 143 seconds. Not tainted 5.8.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28880 14980 6958 0x00004004 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8a9/0x19d0 kernel/sched/core.c:4155 schedule+0xc4/0x2b0 kernel/sched/core.c:4230 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4289 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8a0/0x13e0 kernel/locking/mutex.c:1103 blkdev_put+0x1e/0x450 fs/block_dev.c:1921 blkdev_close+0x8a/0xd0 fs/block_dev.c:1970 __fput+0x2a4/0x7a0 fs/file_table.c:281 task_work_run+0xc2/0x160 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:216 [inline] __prepare_exit_to_usermode+0x208/0x210 arch/x86/entry/common.c:246 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:368 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007f28d97a6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00000000004e8e20 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000409 R14: 00000000004c6a64 R15: 00007f28d97a76d4 INFO: task syz-executor.2:14997 blocked for more than 143 seconds. Not tainted 5.8.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28880 14997 6958 0x00000004 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8a9/0x19d0 kernel/sched/core.c:4155 schedule+0xc4/0x2b0 kernel/sched/core.c:4230 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4289 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8a0/0x13e0 kernel/locking/mutex.c:1103 __blkdev_get+0x12c/0x1150 fs/block_dev.c:1579 blkdev_get+0x1aa/0x260 fs/block_dev.c:1728 do_dentry_open+0x436/0x1030 fs/open.c:828 do_open fs/namei.c:3243 [inline] path_openat+0xd1a/0x21e0 fs/namei.c:3360 do_filp_open+0x171/0x240 fs/namei.c:3387 do_sys_openat2+0x2dc/0x500 fs/open.c:1179 do_sys_open+0x85/0xd0 fs/open.c:1195 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416621 Code: Bad RIP value. RSP: 002b:00007f28d97857a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000416621 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f28d9785850 RBP: 000000000078bfa0 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c0f R14: 00000000004ce39d R15: 00007f28d97866d4 Showing all locks held in the system: 1 lock held by khungtaskd/1178: #0: ffffffff88db7040 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x52/0x28d kernel/locking/lockdep.c:5779 1 lock held by systemd-journal/3898: #0: ffff8880ae835dd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1261 [inline] #0: ffff8880ae835dd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x269/0x19d0 kernel/sched/core.c:4101 2 locks held by in:imklog/6421: #0: ffff8880a3aab130 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:826 #1: ffff8880ae835dd8 (&rq->lock){-.-.}-{2:2}, at: fs_reclaim_acquire.part.99+0x0/0x30 include/linux/page-flags.h:191 1 lock held by systemd-udevd/8225: #0: ffff888088e570c0 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_put+0xd7/0x610 fs/block_dev.c:1888 1 lock held by systemd-udevd/8303: #0: ffff888088e93080 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_put+0xd7/0x610 fs/block_dev.c:1888 1 lock held by systemd-udevd/8304: #0: ffff888088e51980 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_put+0xd7/0x610 fs/block_dev.c:1888 1 lock held by systemd-udevd/8324: #0: ffff888088e242c0 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_put+0xd7/0x610 fs/block_dev.c:1888 1 lock held by systemd-udevd/8930: #0: ffff888088e58780 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x12c/0x1150 fs/block_dev.c:1579 1 lock held by syz-executor.2/14980: #0: ffff888088e58780 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x1e/0x450 fs/block_dev.c:1921 1 lock held by syz-executor.2/14997: #0: ffff888088e58780 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x12c/0x1150 fs/block_dev.c:1579 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1178 Comm: khungtaskd Not tainted 5.8.0-rc2-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+0x12f/0x192 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.8+0x4b/0x83 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x136/0x14d 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+0x95d/0xc90 kernel/hung_task.c:295 kthread+0x36b/0x440 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:unwind_next_frame+0xee9/0x1ee0 arch/x86/kernel/unwind_orc.c:543 Code: 00 0f 85 dd 0c 00 00 4c 89 ea 49 c7 47 58 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 4c 89 ea 83 e2 07 <38> d0 7f 08 84 c0 0f 85 8d 09 00 00 48 89 ca 41 c6 47 35 00 4c 89 RSP: 0018:ffffc90000d2f700 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 1ffff920001a5ee8 RCX: ffffffff8a2b33bc RDX: 0000000000000005 RSI: ffffc90000d2fe90 RDI: ffffc90000d2f830 RBP: 0000000000000001 R08: ffffffff8a2b33b8 R09: ffffffff8a2b33bd R10: ffffc90000d2f837 R11: 000000000006601e R12: ffffc90000d2fe98 R13: ffffc90000d2f80d R14: ffffc90000d2f828 R15: ffffc90000d2f7d8 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2897471000 CR3: 00000000a7419000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x84/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x85/0xb0 kernel/stacktrace.c:123 save_stack+0x19/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.18+0xc1/0xd0 mm/kasan/common.c:494 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc_node mm/slab.c:3263 [inline] kmem_cache_alloc_node_trace+0x13a/0x790 mm/slab.c:3593 __do_kmalloc_node mm/slab.c:3615 [inline] __kmalloc_node_track_caller+0x35/0x60 mm/slab.c:3630 __kmalloc_reserve.isra.51+0x29/0xa0 net/core/skbuff.c:142 __alloc_skb+0xbd/0x510 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:500 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:557 [inline] nsim_dev_trap_report_work+0x272/0xb30 drivers/net/netdevsim/dev.c:598 process_one_work+0x908/0x15d0 kernel/workqueue.c:2269 worker_thread+0x82/0xb50 kernel/workqueue.c:2415 kthread+0x36b/0x440 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293