[11118] 0 11118 17733 8693 28 4 0 1000 syz-executor2 [11144] 0 11144 17667 8289 25 4 0 1000 syz-executor3 [11155] 0 11155 17733 9028 27 4 0 1000 syz-executor3 [11162] 0 11162 17667 8231 25 4 0 1000 syz-executor2 INFO: task syz-executor1:1131 blocked for more than 140 seconds. Not tainted 4.14.91+ #3 [11232] 0 11232 17667 8236 25 4 0 1000 syz-executor3 [11241] 0 11241 17667 8236 25 4 0 1000 syz-executor3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [11265] 0 11265 17601 8200 24 3 0 1000 syz-executor3 syz-executor1 D30384 1131 1839 0x00000004 Call Trace: [11294] 0 11294 17700 9014 27 4 0 1000 syz-executor2 [11299] 0 11299 17601 8231 24 4 0 1000 syz-executor3 [11314] 0 11314 17700 9788 28 4 0 1000 syz-executor1 schedule+0x92/0x1c0 kernel/sched/core.c:3490 __lock_sock+0x12b/0x220 net/core/sock.c:2237 lock_sock_nested+0xe1/0x100 net/core/sock.c:2758 [11332] 0 11332 17667 8672 25 4 0 1000 syz-executor5 [11341] 0 11341 17700 9014 27 4 0 1000 syz-executor2 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x885/0x2830 net/packet/af_packet.c:3780 [11363] 0 11363 17667 9736 28 4 0 1000 syz-executor1 [11364] 0 11364 17700 8549 28 4 0 1000 syz-executor2 [11374] 0 11374 17667 8815 25 4 0 1000 syz-executor5 [11402] 0 11402 17733 8520 26 4 0 1000 syz-executor5 [11410] 0 11410 17700 8549 28 4 0 1000 syz-executor2 INFO: task syz-executor1:1134 blocked for more than 140 seconds. [11417] 0 11417 17667 9736 28 4 0 1000 syz-executor1 Not tainted 4.14.91+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [11457] 0 11457 17733 8714 26 4 0 1000 syz-executor5 syz-executor1 D30384 1134 1839 0x00000004 Call Trace: [11459] 0 11459 17733 8283 26 4 0 1000 syz-executor2 [11550] 0 11550 17634 8231 24 4 0 1000 syz-executor5 schedule+0x92/0x1c0 kernel/sched/core.c:3490 [11601] 0 11601 17601 8229 24 4 0 1000 syz-executor5 [11609] 0 11609 17700 8674 25 4 0 1000 syz-executor5 __lock_sock+0x12b/0x220 net/core/sock.c:2237 lock_sock_nested+0xe1/0x100 net/core/sock.c:2758 [11617] 0 11617 17696 8236 25 4 0 1000 syz-executor0 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x885/0x2830 net/packet/af_packet.c:3780 [11633] 0 11633 17700 9742 28 4 0 1000 syz-executor0 [11639] 0 11639 17700 8539 25 4 0 1000 syz-executor1 [11656] 0 11656 17700 9742 28 4 0 1000 syz-executor0 [11665] 0 11665 17766 9703 28 4 0 1000 syz-executor1 [11672] 0 11672 17700 8334 25 4 0 1000 syz-executor5 Showing all locks held in the system: 2 locks held by init/1: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by rsyslogd/1614: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by getty/1743: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 2 locks held by syz-fuzzer/1772: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by kworker/u4:8/25782: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 2 locks held by udevd/32649: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by syz-executor1/1129: #0: (sk_lock-AF_PACKET){+.+.}, at: [] lock_sock include/net/sock.h:1452 [inline] #0: (sk_lock-AF_PACKET){+.+.}, at: [] packet_setsockopt+0x395/0x2830 net/packet/af_packet.c:3671 1 lock held by getty/1142: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.91+ #3 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 [11677] 0 11677 17700 9048 28 4 0 1000 syz-executor0 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 25779 Comm: kworker/u4:7 Not tainted 4.14.91+ #3 Workqueue: writeback wb_workfn (flush-8:0) task: ffff888197599780 task.stack: ffff888145318000 RIP: 0010:lock_acquire+0x122/0x380 kernel/locking/lockdep.c:3993 RSP: 0000:ffff88814531e7b0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000246 RCX: 0000000000000000 RDX: 1ffff11032eb33f5 RSI: ffff88819759a0a0 RDI: ffffffffa6567c18 RBP: ffff888197599780 R08: 0000000000000914 R09: 0000000000040234 R10: ffff88819759a0a0 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000c45000 CR3: 0000000061026006 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] __list_lru_count_one mm/list_lru.c:171 [inline] list_lru_count_one+0x7f/0x1d0 mm/list_lru.c:182 list_lru_shrink_count include/linux/list_lru.h:117 [inline] super_cache_count+0x188/0x2b0 fs/super.c:144 do_shrink_slab mm/vmscan.c:328 [inline] shrink_slab.part.0+0x251/0xa40 mm/vmscan.c:504 shrink_slab mm/vmscan.c:468 [inline] shrink_node+0x8b5/0xbf0 mm/vmscan.c:2667 shrink_zones mm/vmscan.c:2814 [inline] do_try_to_free_pages+0x350/0xd80 mm/vmscan.c:2876 try_to_free_pages+0x20a/0x6c0 mm/vmscan.c:3082 __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+0xac8/0x22e0 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+0x246/0x770 mm/filemap.c:1476 find_or_create_page include/linux/pagemap.h:326 [inline] ext4_mb_load_buddy_gfp+0x966/0x1210 fs/ext4/mballoc.c:1170 ext4_mb_load_buddy fs/ext4/mballoc.c:1253 [inline] ext4_mb_regular_allocator+0x689/0xeb0 fs/ext4/mballoc.c:2202 ext4_mb_new_blocks+0x16ca/0x38b0 fs/ext4/mballoc.c:4573 ext4_ext_map_blocks+0x274f/0x45c0 fs/ext4/extents.c:4479 ext4_map_blocks+0x77a/0x1580 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+0x167d/0x3000 fs/ext4/inode.c:2885 do_writepages+0xe5/0x280 mm/page-writeback.c:2341 __writeback_single_inode+0xd2/0x1040 fs/fs-writeback.c:1320 writeback_sb_inodes+0x4b7/0xd00 fs/fs-writeback.c:1584 __writeback_inodes_wb+0xbc/0x200 fs/fs-writeback.c:1653 wb_writeback+0x5f7/0xb70 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+0x83d/0xdd0 fs/fs-writeback.c:1928 process_one_work+0x7c6/0x14e0 kernel/workqueue.c:2114 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2248 kthread+0x310/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Code: 89 f1 ff 74 24 60 49 83 f1 01 41 52 44 89 e6 41 83 e1 01 e8 f1 a8 ff ff 48 b8 00 00 00 00 00 fc ff df 65 48 8b 2c 25 c0 de 01 00 <48> 8d bd 2c 08 00 00 48 83 c4 20 48 89 fa 48 c1 ea 03 0f b6 14