INFO: task syz-executor.5:6618 blocked for more than 143 seconds. Not tainted 5.9.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:29272 pid: 6618 ppid: 7256 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 request_wait_answer+0x458/0x7f0 fs/fuse/dev.c:402 __fuse_request_send fs/fuse/dev.c:421 [inline] fuse_simple_request+0x526/0xbf0 fs/fuse/dev.c:503 fuse_do_getattr+0x226/0xc40 fs/fuse/dir.c:952 fuse_update_get_attr fs/fuse/dir.c:988 [inline] fuse_getattr+0x37f/0x430 fs/fuse/dir.c:1705 vfs_getattr_nosec+0x246/0x2e0 fs/stat.c:87 vfs_getattr fs/stat.c:124 [inline] vfs_statx+0x199/0x390 fs/stat.c:206 vfs_stat include/linux/fs.h:3170 [inline] __do_sys_newstat+0x91/0x110 fs/stat.c:361 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d579 Code: Bad RIP value. RSP: 002b:00007fba97c00c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000033880 RCX: 000000000045d579 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200004c0 RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 000000000169fb6f R14: 00007fba97c019c0 R15: 000000000118cf4c INFO: task syz-executor.5:6715 blocked for more than 143 seconds. Not tainted 5.9.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:29272 pid: 6715 ppid: 7256 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 request_wait_answer+0x458/0x7f0 fs/fuse/dev.c:402 __fuse_request_send fs/fuse/dev.c:421 [inline] fuse_simple_request+0x526/0xbf0 fs/fuse/dev.c:503 fuse_do_getattr+0x226/0xc40 fs/fuse/dir.c:952 Showing all locks held in the system: 3 locks held by kworker/0:0/5: 1 lock held by khungtaskd/1170: #0: ffffffff89bd6900 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5825 1 lock held by systemd-udevd/3910: 1 lock held by in:imklog/6735: #0: ffff8880a8df43b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 2 locks held by syz-executor.5/6715: #0: ffff888085a85750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:779 [inline] #0: ffff888085a85750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:595 #1: ffffffff89bdaf68 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff89bdaf68 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4e8/0x5f0 kernel/rcu/tree_exp.h:838 1 lock held by syz-executor.5/13116: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-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+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:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3903 Comm: systemd-journal Not tainted 5.9.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:67 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffffc900056779e8 EFLAGS: 00000202 RAX: ffff8880a780ab00 RBX: ffffed1014f0157d RCX: 0000000000000000 RDX: 000000000000003d RSI: 0000000000000000 RDI: ffffed1014f0157d RBP: 00000000000001e8 R08: ffffed1014f01540 R09: ffffed1014f01540 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a780aa00 R13: ffff8880a780abe7 R14: ffff88821bc47b00 R15: 00000000000001e8 FS: 00007fb38e0d48c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000021000000 CR3: 0000000092f51000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kasan_poison_shadow mm/kasan/common.c:130 [inline] kasan_unpoison_shadow+0x33/0x40 mm/kasan/common.c:144 __kasan_kmalloc.constprop.0+0x4b/0xd0 mm/kasan/common.c:456 slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc+0x138/0x3a0 mm/slab.c:3482 kmem_cache_zalloc include/linux/slab.h:656 [inline] __alloc_file+0x21/0x350 fs/file_table.c:101 alloc_empty_file+0x6d/0x170 fs/file_table.c:151 path_openat+0xe3/0x2730 fs/namei.c:3354 do_filp_open+0x17e/0x3c0 fs/namei.c:3395 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fb38d664840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffc1a0f81e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc1a0f84f0 RCX: 00007fb38d664840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005574cec8ed40 RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 00005574cec82040 R14: 00007ffc1a0f84b0 R15: 00005574cec8ee30