[16715] 0 16715 17618 8410 25 4 0 0 syz-executor0 [16784] 0 16784 17651 8436 25 4 0 0 syz-executor2 [16828] 0 16828 17618 8410 25 4 0 0 syz-executor3 [16852] 0 16852 17585 8232 24 3 0 0 syz-executor3 [16859] 0 16859 17651 8431 25 4 0 0 syz-executor2 INFO: task syz-executor0:27657 blocked for more than 140 seconds. Not tainted 4.14.89+ #28 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [16890] 0 16890 17651 8236 24 3 0 0 syz-executor3 syz-executor0 D29592 27657 1842 0x10000004 Call Trace: [17032] 0 17032 17585 8232 24 3 0 0 syz-executor0 [17040] 0 17040 17651 8236 25 3 0 0 syz-executor0 [17196] 0 17196 17684 12524 33 4 0 0 syz-executor2 schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __lock_sock+0x11d/0x210 net/core/sock.c:2237 [17216] 0 17216 17684 12524 33 4 0 0 syz-executor2 lock_sock_nested+0xe3/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x70a/0x2680 net/packet/af_packet.c:3794 [17308] 0 17308 17651 8434 25 4 0 0 syz-executor2 [17411] 0 17411 17585 8224 24 3 0 0 syz-executor3 [17422] 0 17422 17651 8440 25 4 0 1000 syz-executor1 [17429] 0 17429 17651 8412 25 4 0 0 syz-executor3 [17430] 0 17430 17651 8236 24 3 0 0 syz-executor3 [17716] 0 17716 17651 8440 25 4 0 1000 syz-executor1 SYSC_setsockopt net/socket.c:1864 [inline] SyS_setsockopt+0x132/0x220 net/socket.c:1843 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457669 RSP: 002b:00007fb74cc01c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457669 RDX: 0000000000000009 RSI: 0000000000000107 RDI: 0000000000000003 RBP: 000000000072bfa0 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 00007fb74cc026d4 [17725] 0 17725 17618 8413 27 4 0 0 syz-executor0 R13: 00000000004c4ea4 R14: 00000000004d8f58 R15: 00000000ffffffff [18035] 0 18035 17718 8435 26 4 0 0 syz-executor3 [18469] 0 18469 17585 8438 25 3 0 1000 syz-executor1 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 [18473] 0 18473 17585 8231 24 3 0 0 syz-executor2 2 locks held by rs:main Q:Reg/1626: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 [18474] 0 18474 17651 8444 25 3 0 1000 syz-executor1 2 locks held by rsyslogd/1629: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 2 locks held by getty/1756: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x1700 drivers/tty/n_tty.c:2156 2 locks held by syz-fuzzer/1776: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.89+ #28 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 [18480] 0 18480 17651 8235 24 3 0 0 syz-executor2 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 [18535] 0 18535 17651 8431 26 4 0 0 syz-executor2 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 22227 Comm: kworker/u4:24 Not tainted 4.14.89+ #28 Workqueue: writeback wb_workfn (flush-8:0) task: ffff88815ef0de00 task.stack: ffff888194e10000 RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:65 RSP: 0000:ffff888194e16598 EFLAGS: 00000046 RAX: ffff88815ef0de00 RBX: ffff8881d655d220 RCX: ffff888194e16e44 RDX: 1ffffd4000e6cb24 RSI: 0000000000000000 RDI: ffffea0007365900 RBP: ffffea000736591c R08: ffff888194e16e2c R09: ffff888194e16e44 R10: ffff88815ef0e6f8 R11: 0000000000000001 R12: ffffea0007365900 R13: ffffea0007365920 R14: ffff8881d655d220 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881d7600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0705dade40 CR3: 00000001fa226003 CR4: 00000000001606b0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: ClearPageLRU include/linux/page-flags.h:273 [inline] __isolate_lru_page+0x2fa/0x480 mm/vmscan.c:1470 isolate_lru_pages.isra.14+0x3e4/0xe90 mm/vmscan.c:1556 shrink_inactive_list+0x220/0xee0 mm/vmscan.c:1794 shrink_list mm/vmscan.c:2175 [inline] shrink_node_memcg+0x5e8/0x12e0 mm/vmscan.c:2438 shrink_node+0x301/0xbf0 mm/vmscan.c:2630 shrink_zones mm/vmscan.c:2812 [inline] do_try_to_free_pages+0x349/0xde0 mm/vmscan.c:2874 try_to_free_pages+0x204/0x6b0 mm/vmscan.c:3080 __perform_reclaim mm/page_alloc.c:3593 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:3614 [inline] __alloc_pages_slowpath mm/page_alloc.c:4001 [inline] __alloc_pages_nodemask+0xa8a/0x2180 mm/page_alloc.c:4210 __alloc_pages include/linux/gfp.h:461 [inline] __alloc_pages_node include/linux/gfp.h:474 [inline] alloc_pages_node include/linux/gfp.h:488 [inline] __page_cache_alloc include/linux/pagemap.h:226 [inline] pagecache_get_page+0x242/0x770 mm/filemap.c:1476 find_or_create_page include/linux/pagemap.h:326 [inline] grow_dev_page fs/buffer.c:1003 [inline] grow_buffers fs/buffer.c:1076 [inline] __getblk_slow fs/buffer.c:1103 [inline] __getblk_gfp+0x23e/0x720 fs/buffer.c:1382 sb_getblk_gfp include/linux/buffer_head.h:332 [inline] __read_extent_tree_block+0xa3/0x770 fs/ext4/extents.c:521 ext4_find_extent+0x34a/0x980 fs/ext4/extents.c:920 ext4_ext_map_blocks+0x1b5/0x4600 fs/ext4/extents.c:4298 ext4_map_blocks+0x6ce/0x1560 fs/ext4/inode.c:636 mpage_map_one_extent fs/ext4/inode.c:2462 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2515 [inline] ext4_writepages+0x1675/0x3040 fs/ext4/inode.c:2885 do_writepages+0xe0/0x270 mm/page-writeback.c:2341 __writeback_single_inode+0xd8/0x1020 fs/fs-writeback.c:1320 writeback_sb_inodes+0x468/0xcd0 fs/fs-writeback.c:1584 __writeback_inodes_wb+0xf8/0x1e0 fs/fs-writeback.c:1653 wb_writeback+0x4ee/0xb90 fs/fs-writeback.c:1762 wb_check_old_data_flush fs/fs-writeback.c:1875 [inline] wb_do_writeback fs/fs-writeback.c:1899 [inline] wb_workfn+0x85d/0xe00 fs/fs-writeback.c:1928 process_one_work+0x86e/0x1670 kernel/workqueue.c:2114 worker_thread+0xdc/0x1000 kernel/workqueue.c:2248 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Code: 00 e9 9f fe ff ff 4c 89 e7 e8 74 03 22 00 e9 2c fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 de 01 00 <48> 85 c0 74 1a 65 8b 15 db f5 50 4c 81 e2 00 01 1f 00 75 0b 8b