INFO: task syz-executor.2:14763 blocked for more than 143 seconds. Not tainted 6.1.0-rc6-syzkaller-00308-g644e9524388a #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:24840 pid:14763 ppid:11545 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5209 [inline] __schedule+0xae9/0x53f0 kernel/sched/core.c:6521 schedule+0xde/0x1b0 kernel/sched/core.c:6597 wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:191 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2628 try_to_writeback_inodes_sb+0x98/0xc0 fs/fs-writeback.c:2676 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2950 ext4_da_write_begin+0x170/0xb50 fs/ext4/inode.c:2977 generic_perform_write+0x256/0x570 mm/filemap.c:3753 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:285 ext4_file_write_iter+0x8bc/0x16e0 fs/ext4/file.c:700 __kernel_write_iter+0x262/0x730 fs/read_write.c:517 dump_emit_page fs/coredump.c:857 [inline] dump_user_range+0x234/0x700 fs/coredump.c:908 elf_core_dump+0x26e2/0x3520 fs/binfmt_elf.c:2312 do_coredump+0x276d/0x3c70 fs/coredump.c:755 get_signal+0x1bf1/0x2440 kernel/signal.c:2844 arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:309 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7f9a5908c0e1 RSP: 002b:0000000020000550 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f9a591abf80 RCX: 00007f9a5908c0d9 RDX: 0000000020000580 RSI: 0000000020000550 RDI: 0000000000000000 RBP: 00007f9a590e7ae9 R08: 0000000020000600 R09: 0000000020000600 R10: 00000000200005c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc11a34c0f R14: 00007f9a59e24300 R15: 0000000000022000 Showing all locks held in the system: 5 locks held by kworker/u4:0/9: #0: ffff8880121c6938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880121c6938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8880121c6938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff8880121c6938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff8880121c6938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff8880121c6938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x86d/0x1710 kernel/workqueue.c:2260 #1: ffffc900000e7da8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1710 kernel/workqueue.c:2264 #2: ffffffff8dea0f50 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9f/0xb00 net/core/net_namespace.c:563 #3: ffffffff8deb4b68 (rtnl_mutex){+.+.}-{3:3}, at: ip6gre_exit_batch_net+0x8c/0x760 net/ipv6/ip6_gre.c:1659 #4: ffffffff8c59a8f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline] #4: ffffffff8c59a8f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x5df/0x780 kernel/rcu/tree_exp.h:946 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8c58f0f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/13: #0: ffffffff8c58edf0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/27: #0: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x57/0x264 kernel/locking/lockdep.c:6494 3 locks held by kworker/u4:3/46: #0: ffff888017344138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888017344138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888017344138 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888017344138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff888017344138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff888017344138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x86d/0x1710 kernel/workqueue.c:2260 #1: ffffc90000b77da8 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1710 kernel/workqueue.c:2264 #2: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by dhcpcd/3208: #0: ffffffff8deb4b68 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x1c4/0x1d70 net/ipv4/devinet.c:1070 2 locks held by getty/3304: #0: ffff88807eea8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177 2 locks held by kworker/0:8/3726: #0: ffff888012066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888012066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888012066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888012066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff888012066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff888012066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x86d/0x1710 kernel/workqueue.c:2260 #1: ffffc9000490fda8 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1710 kernel/workqueue.c:2264 3 locks held by syz-executor.2/14763: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff88805602c030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88805602c030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 #2: ffff88807ef340e0 (&type->s_umount_key#31){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2673 1 lock held by syz-executor.1/15315: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/15334: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/15422: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.0/15442: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.0/15476: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.0/15496: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/15564: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/15578: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/15598: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.0/16144: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/16147: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/16266: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.0/16301: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/16318: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/16326: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/16345: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/16560: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 3 locks held by syz-executor.1/16665: 1 lock held by syz-executor.0/16666: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/16668: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 2 locks held by syz-executor.1/16685: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff888054b56850 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888054b56850 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 1 lock held by syz-executor.0/16690: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/16702: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 2 locks held by syz-executor.1/16704: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff8880839a5440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff8880839a5440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.0/16710: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff8880839a5e48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff8880839a5e48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 1 lock held by syz-executor.3/16728: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.2/16734: 1 lock held by syz-executor.1/16943: 1 lock held by syz-executor.0/16946: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.2/16962: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/16972: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/17001: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/17004: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/17018: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.2/17032: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.0/17033: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 2 locks held by syz-executor.1/17034: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff88804bf08e08 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88804bf08e08 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 1 lock held by syz-executor.5/17094: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 2 locks held by syz-executor.0/17098: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff888054c71810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888054c71810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 1 lock held by syz-executor.3/17100: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 3 locks held by syz-executor.5/17108: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 #1: ffff88814b828990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14a0 fs/jbd2/transaction.c:461 #2: ffff888047130288 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x707/0x18d0 fs/ext4/inode.c:638 1 lock held by syz-executor.1/17111: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.1/17434: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 2 locks held by syz-executor.0/17435: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff8880839a4030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff8880839a4030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 1 lock held by syz-executor.0/17453: 3 locks held by syz-executor.3/17464: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 #1: ffff88814b828990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14a0 fs/jbd2/transaction.c:461 #2: ffff888043be0c90 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x707/0x18d0 fs/ext4/inode.c:638 2 locks held by syz-executor.1/17469: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff8880288b4a38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff8880288b4a38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.0/17513: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff8880438dc030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff8880438dc030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 1 lock held by syz-executor.1/17515: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/17523: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/17635: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 1 lock held by syz-executor.3/17733: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 3 locks held by syz-executor.3/17743: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 #1: ffff88814b828990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14a0 fs/jbd2/transaction.c:461 #2: ffff888054b552c8 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x707/0x18d0 fs/ext4/inode.c:638 3 locks held by syz-executor.4/17760: #0: ffff88807ef36b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1af/0x690 mm/page-writeback.c:2469 #1: ffff88814b828990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14a0 fs/jbd2/transaction.c:461 #2: ffff8880288b3eb8 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x707/0x18d0 fs/ext4/inode.c:638 2 locks held by syz-executor.1/17976: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff888037668e08 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888037668e08 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.1/17987: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff8880464d6850 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff8880464d6850 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.1/18084: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff8880288b5440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff8880288b5440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.0/18092: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff88804bf09810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff88804bf09810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.0/18132: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff8880438d9810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff8880438d9810 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.1/18148: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff888037b33628 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888037b33628 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.0/18151: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff888037b34a38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888037b34a38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.0/18167: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff888047134a38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888047134a38 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 2 locks held by syz-executor.1/18169: #0: ffff88807ef34460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1bf1/0x2440 kernel/signal.c:2844 #1: ffff888073237258 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline] #1: ffff888073237258 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:279 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.1.0-rc6-syzkaller-00308-g644e9524388a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x333/0x3c0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xc75/0xfc0 kernel/hung_task.c:377 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3208 Comm: dhcpcd Not tainted 6.1.0-rc6-syzkaller-00308-g644e9524388a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline] RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:52 Code: 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01 RSP: 0018:ffffc9000359f7d8 EFLAGS: 00000213 RAX: 1ffffffff1cd232a RBX: ffffffff8e691954 RCX: ffffffff81e5d83a RDX: 0000000000000000 RSI: ffffffff8ee2d5b4 RDI: ffffffff8e691954 RBP: ffffffff8e691954 R08: ffffffff8c405bc0 R09: ffffc9000359f8c4 R10: fffff520006b3f1d R11: 0000000000092080 R12: ffffffff8e691954 R13: ffffffff8e691954 R14: ffffffff8e691954 R15: dffffc0000000000 FS: 00007f1fb6121740(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d2fb480300 CR3: 000000001c806000 CR4: 0000000000350ef0 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:178 [inline] unwind_next_frame+0x2a7/0x1d00 arch/x86/kernel/unwind_orc.c:448 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x90/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node+0x5d/0xd0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x43/0x1b0 mm/util.c:581 kvmalloc include/linux/slab.h:706 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x7fb/0x1280 fs/seq_file.c:210 kernfs_fop_read_iter+0x546/0x7a0 fs/kernfs/file.c:275 call_read_iter include/linux/fs.h:2185 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x681/0x930 fs/read_write.c:470 ksys_read+0x12b/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f1fb62098fe Code: c0 e9 e6 fe ff ff 50 48 8d 3d 0e c7 09 00 e8 c9 cf 01 00 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 66 0f 1f 84 00 00 00 00 00 48 83 ec 28 RSP: 002b:00007ffeac1aded8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000055d2fb485eb0 RCX: 00007f1fb62098fe RDX: 0000000000001000 RSI: 000055d2fb4783f0 RDI: 0000000000000018 RBP: 00007f1fb62d6380 R08: 0000000000000018 R09: 00007f1fb62d9a60 R10: 0000000000000002 R11: 0000000000000246 R12: 000055d2fb485eb0 R13: 0000000000000d68 R14: 00007f1fb62d5780 R15: 0000000000000d68