INFO: task syz-executor.2:19414 blocked for more than 143 seconds. Not tainted 5.15.152-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:22496 pid:19414 ppid: 19279 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5030 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376 schedule+0x11b/0x1f0 kernel/sched/core.c:6459 wb_wait_for_completion+0x164/0x290 fs/fs-writeback.c:191 __writeback_inodes_sb_nr+0x2ce/0x370 fs/fs-writeback.c:2684 try_to_writeback_inodes_sb+0x94/0xb0 fs/fs-writeback.c:2732 ext4_nonda_switch fs/ext4/inode.c:2933 [inline] ext4_da_write_begin+0x228/0xb60 fs/ext4/inode.c:2960 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3785 ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268 ext4_file_write_iter+0x87c/0x1990 __kernel_write+0x5b1/0xa60 fs/read_write.c:539 __dump_emit+0x264/0x3a0 fs/coredump.c:875 dump_user_range+0x91/0x320 fs/coredump.c:949 elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285 do_coredump+0x1852/0x31e0 fs/coredump.c:826 get_signal+0xc06/0x14e0 kernel/signal.c:2875 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314 exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562 asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562 RIP: 0033:0x7f7dab864db1 RSP: 002b:00000000200002e0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f7dab992f80 RCX: 00007f7dab864da9 RDX: 00000000200001c0 RSI: 00000000200002e0 RDI: 0000000010001000 RBP: 00007f7dab8b147a R08: 0000000020000340 R09: 0000000020000340 R10: 0000000020000300 R11: 0000000000000206 R12: 0000000000000000 R13: 000000000000000b R14: 00007f7dab992f80 R15: 00007ffe51c72ba8 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8c91f720 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 5 locks held by kworker/u4:2/154: 5 locks held by kworker/u4:3/155: #0: ffff888011dcd138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc90001c27d20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 #2: ffffffff8d9cfe50 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf1/0xb60 net/core/net_namespace.c:558 #3: ffffffff8d9dba08 (rtnl_mutex){+.+.}-{3:3}, at: ip_tunnel_delete_nets+0xc9/0x330 net/ipv4/ip_tunnel.c:1132 #4: ffffffff8c923ce8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #4: ffffffff8c923ce8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x280/0x740 kernel/rcu/tree_exp.h:845 2 locks held by getty/3258: #0: ffff88807f032098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc90002bae2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158 2 locks held by kworker/0:9/9229: #0: ffff888011c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc90003b97d20 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 5 locks held by kworker/1:15/18692: #0: ffff8881419c8538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc900032e7d20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 #2: ffffffff8c95beb8 (kcov_remote_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:363 [inline] #2: ffffffff8c95beb8 (kcov_remote_lock){..-.}-{2:2}, at: kcov_remote_stop+0x3f2/0x4d0 kernel/kcov.c:1011 #3: ffff88807e78dce0 (&nsim_trap_data->trap_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:363 [inline] #3: ffff88807e78dce0 (&nsim_trap_data->trap_lock){+.+.}-{2:2}, at: nsim_dev_trap_report drivers/net/netdevsim/dev.c:707 [inline] #3: ffff88807e78dce0 (&nsim_trap_data->trap_lock){+.+.}-{2:2}, at: nsim_dev_trap_report_work+0x1a3/0xab0 drivers/net/netdevsim/dev.c:762 #4: ffffffff9164c5a8 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x63/0x4e0 lib/debugobjects.c:693 3 locks held by syz-executor.2/19414: #0: ffff88807f0f2460 (sb_writers#5){.+.+}-{0:0}, at: do_coredump+0x1825/0x31e0 fs/coredump.c:825 #1: ffff88803dbebfc0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #1: ffff88803dbebfc0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_buffered_write_iter+0xa0/0x360 fs/ext4/file.c:262 #2: ffff88807f0f20e0 (&type->s_umount_key#32){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x1d/0xb0 fs/fs-writeback.c:2729 5 locks held by kworker/0:0/19841: #0: ffff8881419c8538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283 #1: ffffc90002ea7d20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285 #2: ffff888147da3220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #2: ffff888147da3220 (&dev->mutex){....}-{3:3}, at: hub_event+0x208/0x54c0 drivers/usb/core/hub.c:5759 #3: ffff8880b9a3a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475 #4: ffffffff8c931e88 (tk_core.seq.seqcount){----}-{0:0}, at: timekeeping_get_delta kernel/time/timekeeping.c:254 [inline] #4: ffffffff8c931e88 (tk_core.seq.seqcount){----}-{0:0}, at: timekeeping_get_ns kernel/time/timekeeping.c:388 [inline] #4: ffffffff8c931e88 (tk_core.seq.seqcount){----}-{0:0}, at: ktime_get+0x7f/0x270 kernel/time/timekeeping.c:831 1 lock held by syz-executor.0/19981: 2 locks held by syz-executor.0/19986: 2 locks held by syz-executor.0/19988: 4 locks held by syz-executor.0/20884: 4 locks held by syz-executor.0/20886: 2 locks held by syz-executor.0/20899: 4 locks held by syz-executor.0/20905: 4 locks held by syz-executor.0/20910: 2 locks held by syz-executor.0/20911: 3 locks held by syz-executor.4/20929: 2 locks held by syz-executor.4/20930: 2 locks held by syz-executor.0/20945: 3 locks held by syz-executor.0/20946: 5 locks held by syz-executor.2/20950: 4 locks held by syz-executor.2/20951: 4 locks held by syz-executor.2/20956: 3 locks held by syz-executor.2/20959: 1 lock held by syz-executor.4/20963: 3 locks held by syz-executor.4/20965: 4 locks held by syz-executor.4/20971: 4 locks held by syz-executor.4/20972: 4 locks held by syz-executor.3/20980: 4 locks held by syz-executor.3/20981: 4 locks held by syz-executor.1/20987: 3 locks held by syz-executor.1/20988: 4 locks held by syz-executor.2/20996: 2 locks held by syz-executor.2/20998: 4 locks held by syz-executor.3/21006: 4 locks held by syz-executor.1/21014: 2 locks held by syz-executor.1/21015: 1 lock held by syz-executor.0/21026: 2 locks held by syz-executor.0/21027: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.152-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xe72/0xeb0 kernel/hung_task.c:295 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 20963 Comm: syz-executor.4 Not tainted 5.15.152-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 RIP: 0010:ext4_ext_map_blocks+0x6ee/0x7690 fs/ext4/extents.c:4235 Code: 54 4d 00 00 48 8b 44 24 18 44 8b 20 48 8d 84 24 10 02 00 00 48 c1 e8 03 42 0f b6 04 38 84 c0 48 8b 54 24 38 0f 85 50 4d 00 00 <44> 89 a4 24 10 02 00 00 48 8d 5a 50 48 89 d8 48 c1 e8 03 48 89 44 RSP: 0018:ffffc900035a6480 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 000000000000000b RCX: ffff88801888bb80 RDX: ffff88807f0f4000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900035a6790 R08: ffffffff8215b1bf R09: fffffbfff1bc71b6 R10: 0000000000000000 R11: dffffc0000000001 R12: 00000000000024ac R13: ffffc900035a6670 R14: ffff88804f8cb720 R15: dffffc0000000000 FS: 00007f989e6b26c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556e21788 CR3: 0000000083096000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_map_blocks+0xaad/0x1e00 fs/ext4/inode.c:645 _ext4_get_block+0x23b/0x660 fs/ext4/inode.c:792 ext4_block_write_begin+0x6b0/0x13a0 fs/ext4/inode.c:1077 ext4_write_begin+0x6c6/0x15f0 ext4_da_write_begin+0x342/0xb60 fs/ext4/inode.c:2963 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3785 ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268 ext4_file_write_iter+0x87c/0x1990 __kernel_write+0x5b1/0xa60 fs/read_write.c:539 __dump_emit+0x264/0x3a0 fs/coredump.c:875 dump_user_range+0x91/0x320 fs/coredump.c:949 elf_core_dump+0x3c7d/0x4570 fs/binfmt_elf.c:2285 do_coredump+0x1852/0x31e0 fs/coredump.c:826 get_signal+0xc06/0x14e0 kernel/signal.c:2875 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314 exc_page_fault+0x342/0x740 arch/x86/mm/fault.c:1544 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0033:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 002b:0000000020000408 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f98a025ff80 RCX: 00007f98a0131da9 RDX: 0000000020000480 RSI: 0000000020000400 RDI: 0000000000000000 RBP: 00007f98a017e47a R08: 0000000020000500 R09: 0000000020000500 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f98a025ff80 R15: 00007ffc68eb83c8