INFO: task syz-executor.2:15974 can't die for more than 143 seconds. syz-executor.2 R running task 23208 15974 8902 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1046: #0: 0000000040fbe475 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5262 1 lock held by rsyslogd/8765: #0: 0000000057a3fb91 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8855: #0: 0000000074b2c30e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e6154a24 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8856: #0: 00000000b45a5bc8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002add46ed (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8857: #0: 00000000106131c5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000062deb5d4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8858: #0: 000000004417b851 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002bcb5d07 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8859: #0: 00000000b32f02e5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d30a2401 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8860: #0: 00000000fafdad4a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000d3df0ce (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8861: #0: 00000000b8eed6e8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000f2d04170 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/15974: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1046 Comm: khungtaskd Not tainted 5.2.0-rc3-next-20190607 #11 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xb88/0x12b0 kernel/hung_task.c:333 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.735 msecs NMI backtrace for cpu 0 CPU: 0 PID: 15974 Comm: syz-executor.2 Not tainted 5.2.0-rc3-next-20190607 #11 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:sched_clock_cpu+0x6/0x1b0 kernel/sched/clock.c:366 Code: 1f 44 00 00 5d c3 0f 0b 48 c7 c7 00 7b d2 88 e8 20 42 5a 00 eb dd 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 <41> 56 41 55 41 54 53 48 83 ec 20 0f 1f 44 00 00 e8 45 75 d8 ff 48 RSP: 0018:ffff8880ae809f60 EFLAGS: 00000006 RAX: 0000000000000000 RBX: ffff8880ae8205b0 RCX: ffffffff8336410e RDX: 0000000000010000 RSI: ffffffff8336411c RDI: 0000000000000000 RBP: ffff8880ae809f68 R08: ffff8880972da240 R09: ffffed1015d06be0 R10: ffffed1015d06bdf R11: ffff8880ae835efb R12: ffff8880972da240 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f2eb0430700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000422d10 CR3: 00000000a4700000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: irqtime_account_irq+0x6a/0x290 kernel/sched/cputime.c:60 account_irq_exit_time include/linux/vtime.h:114 [inline] irq_exit+0x4c/0x1d0 kernel/softirq.c:411 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1068 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806 RIP: 0010:__read_once_size include/linux/compiler.h:194 [inline] RIP: 0010:update_stack_state+0x464/0x5f0 arch/x86/kernel/unwind_frame.c:271 Code: 01 00 0f 85 0c 01 00 00 49 c7 45 48 00 00 00 00 e9 16 ff ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 e1 48 c1 e9 03 80 3c 01 00 <0f> 85 12 01 00 00 4d 8b 24 24 e9 b0 fe ff ff 49 8d 7d 38 48 b8 00 RSP: 0018:ffff88805b14e5b8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff88805b14fee0 RCX: 1ffff1100b629fdd RDX: 0000000000000010 RSI: 1ffff1100b629c00 RDI: ffff88805b14e790 RBP: ffff88805b14e680 R08: ffff8880972da240 R09: ffff88805b14e7c0 R10: ffff88805b14e790 R11: ffff88805b14e7a0 R12: ffff88805b14fee8 R13: ffff88805b14e768 R14: 1ffff1100b629cbf R15: ffff88805b14e7a8 unwind_next_frame.part.0+0x1a9/0xa20 arch/x86/kernel/unwind_frame.c:334 unwind_next_frame+0x3b/0x50 arch/x86/kernel/unwind_frame.c:288 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xac/0xe0 kernel/stacktrace.c:123 save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:497 slab_post_alloc_hook mm/slab.h:444 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3482 mempool_alloc_slab+0x47/0x60 mm/mempool.c:513 mempool_alloc+0x169/0x380 mm/mempool.c:393 bio_alloc_bioset+0x3b9/0x680 block/bio.c:476 bio_clone_fast+0x26/0x110 block/bio.c:616 bio_split+0x86/0x260 block/bio.c:1879 blk_bio_segment_split block/blk-merge.c:253 [inline] blk_queue_split+0x7d7/0x16d0 block/blk-merge.c:278 blk_mq_make_request+0x16d/0x1d30 block/blk-mq.c:1943 generic_make_request block/blk-core.c:1008 [inline] generic_make_request+0x23c/0xb40 block/blk-core.c:950 submit_bio+0xba/0x480 block/blk-core.c:1116 mpage_bio_submit fs/mpage.c:66 [inline] do_mpage_readpage+0x157d/0x20e0 fs/mpage.c:316 mpage_readpages+0x388/0x630 fs/mpage.c:404 blkdev_readpages+0x2d/0x40 fs/block_dev.c:632 read_pages+0x108/0x540 mm/readahead.c:126 __do_page_cache_readahead+0x4c6/0x5c0 mm/readahead.c:212 ra_submit mm/internal.h:62 [inline] do_sync_mmap_readahead mm/filemap.c:2416 [inline] filemap_fault+0x141a/0x2850 mm/filemap.c:2502 __do_fault+0x111/0x4d0 mm/memory.c:3122 do_shared_fault mm/memory.c:3587 [inline] do_fault mm/memory.c:3665 [inline] handle_pte_fault mm/memory.c:3892 [inline] __handle_mm_fault+0x2a8e/0x3eb0 mm/memory.c:4016 handle_mm_fault+0x3b7/0xa90 mm/memory.c:4053 do_user_addr_fault arch/x86/mm/fault.c:1455 [inline] __do_page_fault+0x5ef/0xda0 arch/x86/mm/fault.c:1521 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1552 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156 RIP: 0010:__put_user_4+0x1c/0x30 arch/x86/lib/putuser.S:70 Code: 1f 00 c3 90 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 1c 25 c0 fd 01 00 48 8b 9b 18 14 00 00 48 83 eb 03 48 39 d9 73 3c 0f 1f 00 <89> 01 31 c0 0f 1f 00 c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 65 48 RSP: 0018:ffff88805b14fcb8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 00007fffffffeffd RCX: 0000000020006538 RDX: 0000000000010687 RSI: ffffffff819a30f3 RDI: 0000000000000286 RBP: ffff88805b14fee0 R08: ffff8880972da240 R09: 0000000000000001 R10: ffff8880972daad0 R11: ffff8880972da240 R12: 0000000000000015 R13: 0000000000040000 R14: 0000000020006500 R15: 0000000000000058 __do_sys_sendmmsg net/socket.c:2418 [inline] __se_sys_sendmmsg net/socket.c:2415 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2415 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2eb042fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459279 RDX: 0800000000000059 RSI: 0000000020005fc0 RDI: 0000000000000006 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2eb04306d4 R13: 00000000004c683e R14: 00000000004db7c0 R15: 00000000ffffffff