INFO: task syz-executor.3:25038 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28760 25038 7095 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 schedule+0xd0/0x2a0 kernel/sched/core.c:4253 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 blkdev_put+0x30/0x520 fs/block_dev.c:1921 blkdev_close+0x8c/0xb0 fs/block_dev.c:1970 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:239 [inline] __prepare_exit_to_usermode+0x1e9/0x1f0 arch/x86/entry/common.c:269 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007ff64f3cfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00000000004ea300 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000418 R14: 00000000004c6f09 R15: 00007ff64f3d06d4 INFO: task syz-executor.3:25041 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27576 25041 7095 0x00000004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 schedule+0xd0/0x2a0 kernel/sched/core.c:4253 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 __blkdev_get+0x167/0x14d0 fs/block_dev.c:1579 blkdev_get+0x45/0x310 fs/block_dev.c:1728 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1870 do_dentry_open+0x501/0x1290 fs/open.c:828 do_open fs/namei.c:3243 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3360 do_filp_open+0x17e/0x3c0 fs/namei.c:3387 do_sys_openat2+0x16f/0x3b0 fs/open.c:1179 do_sys_open fs/open.c:1195 [inline] ksys_open include/linux/syscalls.h:1388 [inline] __do_sys_open fs/open.c:1201 [inline] __se_sys_open fs/open.c:1199 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1199 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416921 Code: Bad RIP value. RSP: 002b:00007ff64f3ae7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000416921 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ff64f3ae850 RBP: 000000000078bfa0 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c7a R14: 00000000004cec75 R15: 00007ff64f3af6d4 INFO: task systemd-udevd:25047 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D26792 25047 3902 0x00004100 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178 schedule+0xd0/0x2a0 kernel/sched/core.c:4253 io_schedule+0xb5/0x120 kernel/sched/core.c:5897 wait_on_page_bit_common+0x34f/0xda0 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:2748 [inline] do_read_cache_page+0x957/0x1390 mm/filemap.c:2791 read_mapping_page include/linux/pagemap.h:437 [inline] read_part_sector+0xf6/0x5af block/partitions/core.c:772 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360 check_partition block/partitions/core.c:140 [inline] blk_add_partitions+0x44b/0xe10 block/partitions/core.c:700 bdev_disk_changed+0x1ea/0x370 fs/block_dev.c:1524 __blkdev_get+0x12ea/0x14d0 fs/block_dev.c:1662 blkdev_get+0x45/0x310 fs/block_dev.c:1728 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1870 do_dentry_open+0x501/0x1290 fs/open.c:828 do_open fs/namei.c:3243 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3360 do_filp_open+0x17e/0x3c0 fs/namei.c:3387 do_sys_openat2+0x16f/0x3b0 fs/open.c:1179 do_sys_open fs/open.c:1195 [inline] ksys_open include/linux/syscalls.h:1388 [inline] __do_sys_open fs/open.c:1201 [inline] __se_sys_open fs/open.c:1199 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1199 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fab80cdf840 Code: Bad RIP value. RSP: 002b:00007ffe9b1213e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055daf3f3bde0 RCX: 00007fab80cdf840 RDX: 000055daf375afe3 RSI: 00000000000a0800 RDI: 000055daf3f26fe0 RBP: 00007ffe9b121560 R08: 000055daf375a670 R09: 0000000000000010 R10: 000055daf375ad0c R11: 0000000000000246 R12: 00007ffe9b1214b0 R13: 000055daf3f3bc80 R14: 0000000000000003 R15: 000000000000000e Showing all locks held in the system: 1 lock held by ksoftirqd/1/16: #0: ffff8880ae735e18 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1261 [inline] #0: ffff8880ae735e18 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x22d/0x1eb0 kernel/sched/core.c:4124 1 lock held by khungtaskd/1152: #0: ffffffff89bc11c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/6490: #0: ffff8880a30f3630 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 2 locks held by agetty/6526: #0: ffff8880a663a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900010f42e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 2 locks held by agetty/6534: #0: ffff8880a64f7098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900010e02e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.3/25038: #0: ffff88808a6e6780 (&bdev->bd_mutex){+.+.}-{3:3}, at: blkdev_put+0x30/0x520 fs/block_dev.c:1921 1 lock held by syz-executor.3/25041: #0: ffff88808a6e6780 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x167/0x14d0 fs/block_dev.c:1579 1 lock held by systemd-udevd/25047: #0: ffff88808a6e6780 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x167/0x14d0 fs/block_dev.c:1579 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1152 Comm: khungtaskd Not tainted 5.8.0-rc5-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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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+0xd7d/0x1000 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3892 Comm: systemd-journal Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:write_comp_data+0x2f/0x80 kernel/kcov.c:218 Code: 05 76 49 8e 7e 65 48 8b 34 25 00 ff 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 04 14 00 00 85 c0 74 4f 8b 86 e0 13 00 00 <83> f8 03 75 44 48 8b 86 e8 13 00 00 8b b6 e4 13 00 00 4c 8b 00 48 RSP: 0018:ffffc90001637d88 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81796f5c RDX: 0000000000000000 RSI: ffff888093d92140 RDI: 0000000000000005 RBP: ffff88809fcd8840 R08: 0000000000000001 R09: ffff888093d92a08 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aa0001c0 R13: ffffffff83550993 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f28465698c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2843b0a008 CR3: 00000000940a2000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0x3c/0x220 kernel/trace/trace_preemptirq.c:43 kfree+0x1cd/0x2c0 mm/slab.c:3758 security_cred_free+0xc3/0x130 security/security.c:1625 put_cred_rcu+0x122/0x4a0 kernel/cred.c:114 __put_cred+0x1de/0x250 kernel/cred.c:148 put_cred include/linux/cred.h:287 [inline] put_cred include/linux/cred.h:280 [inline] revert_creds+0x1a8/0x1f0 kernel/cred.c:598 do_faccessat+0x2ca/0x820 fs/open.c:464 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f28458259c7 Code: Bad RIP value. RSP: 002b:00007ffe3d6b52f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffe3d6b8210 RCX: 00007f28458259c7 RDX: 00007f2846296a00 RSI: 0000000000000000 RDI: 00005595ab6fe9a3 RBP: 00007ffe3d6b5330 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffe3d6b8210 R15: 00007ffe3d6b5820