INFO: task syz-executor942:8475 blocked for more than 143 seconds. Not tainted 5.14.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor942 state:D stack:28984 pid: 8475 ppid: 8448 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5940 schedule+0xd3/0x270 kernel/sched/core.c:6019 d_wait_lookup fs/dcache.c:2562 [inline] d_alloc_parallel+0x105b/0x19f0 fs/dcache.c:2644 __lookup_slow+0x193/0x480 fs/namei.c:1631 lookup_slow fs/namei.c:1663 [inline] walk_component+0x40f/0x6a0 fs/namei.c:1959 lookup_last fs/namei.c:2414 [inline] path_lookupat+0x1bb/0x860 fs/namei.c:2438 filename_lookup+0x1c6/0x5b0 fs/namei.c:2467 user_path_at include/linux/namei.h:57 [inline] __do_sys_chdir fs/open.c:493 [inline] __se_sys_chdir fs/open.c:487 [inline] __x64_sys_chdir+0xb7/0x260 fs/open.c:487 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x44aab9 RSP: 002b:00007f8f216cd2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000050 RAX: ffffffffffffffda RBX: 00000000004cc4e0 RCX: 000000000044aab9 RDX: 00007f8f216cd700 RSI: c8d0f6fefea0521c RDI: 0000000020000040 RBP: 000000000049b0b0 R08: 00007f8f216cd700 R09: 0000000000000000 R10: 00007f8f216cd700 R11: 0000000000000246 R12: 00000000200011c0 R13: 0030656c69662f2e R14: 000000807fffffff R15: 00000000004cc4e8 Showing all locks held in the system: 1 lock held by khungtaskd/1632: #0: ffffffff8b979000 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 6 locks held by kswapd0/2143: 1 lock held by in:imklog/8146: #0: ffff8880164aadf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 1 lock held by syz-executor942/8465: 1 lock held by syz-executor942/8468: 1 lock held by syz-executor942/8470: 1 lock held by syz-executor942/8466: 2 locks held by syz-executor942/8460: 1 lock held by syz-executor942/8475: #0: ffff8880414a0210 (&type->i_mutex_dir_key#7){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:784 [inline] #0: ffff8880414a0210 (&type->i_mutex_dir_key#7){.+.+}-{3:3}, at: lookup_slow fs/namei.c:1662 [inline] #0: ffff8880414a0210 (&type->i_mutex_dir_key#7){.+.+}-{3:3}, at: walk_component+0x400/0x6a0 fs/namei.c:1959 1 lock held by syz-executor942/8473: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1632 Comm: khungtaskd Not tainted 5.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xd0a/0xfc0 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8466 Comm: syz-executor942 Not tainted 5.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mapping_get_entry mm/filemap.c:1778 [inline] RIP: 0010:pagecache_get_page+0x19f/0x18d0 mm/filemap.c:1839 Code: 48 81 fd 02 04 00 00 74 cc e8 dd 83 db ff 48 85 ed 0f 84 68 0c 00 00 e8 cf 83 db ff 41 89 ee 31 ff 41 83 e6 01 48 89 6c 24 20 <44> 89 f6 e8 69 8b db ff 45 84 f6 0f 85 5d 0c 00 00 e8 ab 83 db ff RSP: 0018:ffffc900018f7398 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff88802ed1c2c0 RSI: ffffffff81994d01 RDI: 0000000000000000 RBP: ffffea000183a840 R08: 0000000000000002 R09: 0000000000000000 R10: ffffffff83f42f86 R11: 0000000000000000 R12: 0000000000000002 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000007 FS: 00007f8f216ee700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb54cb9028 CR3: 000000003a9c8000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: find_or_create_page include/linux/pagemap.h:420 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow+0x217/0xb70 fs/buffer.c:1041 __getblk_gfp fs/buffer.c:1334 [inline] __bread_gfp+0x275/0x3c0 fs/buffer.c:1379 sb_bread include/linux/buffer_head.h:303 [inline] get_branch fs/minix/itree_common.c:46 [inline] get_block+0x293/0x1450 fs/minix/itree_common.c:166 minix_get_block+0xbb/0x110 fs/minix/inode.c:397 block_read_full_page+0x28d/0xdf0 fs/buffer.c:2284 do_read_cache_page+0x8e8/0x13c0 mm/filemap.c:3348 read_mapping_page include/linux/pagemap.h:515 [inline] dir_get_page fs/minix/dir.c:70 [inline] minix_find_entry+0x203/0x7e0 fs/minix/dir.c:170 minix_inode_by_name+0x6d/0x460 fs/minix/dir.c:454 minix_lookup fs/minix/namei.c:30 [inline] minix_lookup+0x103/0x190 fs/minix/namei.c:22 __lookup_slow+0x24c/0x480 fs/namei.c:1646 lookup_slow fs/namei.c:1663 [inline] walk_component+0x40f/0x6a0 fs/namei.c:1959 lookup_last fs/namei.c:2414 [inline] path_lookupat+0x1bb/0x860 fs/namei.c:2438 filename_lookup+0x1c6/0x5b0 fs/namei.c:2467 user_path_at include/linux/namei.h:57 [inline] __do_sys_chdir fs/open.c:493 [inline] __se_sys_chdir fs/open.c:487 [inline] __x64_sys_chdir+0xb7/0x260 fs/open.c:487 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x44aab9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8f216ee2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000050 RAX: ffffffffffffffda RBX: 00000000004cc4d0 RCX: 000000000044aab9 RDX: 00007f8f216ee700 RSI: c8d0f6fa9ea0521c RDI: 0000000020000040 RBP: 000000000049b0b0 R08: 00007f8f216ee700 R09: 0000000000000000 R10: 00007f8f216ee700 R11: 0000000000000246 R12: 00000000200011c0 R13: 0030656c69662f2e R14: 000000807fffffff R15: 00000000004cc4d8 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.006 msecs