INFO: task syz-executor.5:10766 blocked for more than 143 seconds. Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:23672 pid:10766 ppid:10465 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5191 [inline] __schedule+0x8fc/0xda0 kernel/sched/core.c:6503 schedule+0xcb/0x190 kernel/sched/core.c:6579 wb_wait_for_completion+0x165/0x290 fs/fs-writeback.c:191 __writeback_inodes_sb_nr+0x2f0/0x3d0 fs/fs-writeback.c:2620 try_to_writeback_inodes_sb+0xa5/0xd0 fs/fs-writeback.c:2668 ext4_nonda_switch fs/ext4/inode.c:2950 [inline] ext4_da_write_begin+0x243/0x760 fs/ext4/inode.c:2977 generic_perform_write+0x314/0x610 mm/filemap.c:3753 ext4_buffered_write_iter+0x122/0x3a0 fs/ext4/file.c:285 ext4_file_write_iter+0x1d0/0x18e0 __kernel_write_iter+0x323/0x770 fs/read_write.c:517 dump_emit_page+0xa79/0xca0 fs/coredump.c:857 dump_user_range+0x5b/0xf0 fs/coredump.c:908 elf_core_dump+0x3d5b/0x4570 fs/binfmt_elf.c:2311 do_coredump+0x1874/0x2900 fs/coredump.c:755 get_signal+0x147e/0x1810 kernel/signal.c:2844 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:309 exc_general_protection+0x348/0x4e0 arch/x86/kernel/traps.c:721 asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fdee828b5b1 RSP: 002b:00000000200002c0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fdee83abf80 RCX: 00007fdee828b5a9 RDX: 0000000020000300 RSI: 00000000200002c0 RDI: 0000000020000000 RBP: 00007fdee82e67b0 R08: 0000000020000380 R09: 0000000020000380 R10: 0000000020000340 R11: 0000000000000206 R12: 0000000000000000 R13: 00007fff33aebbbf R14: 00007fdee8f31300 R15: 0000000000022000 INFO: task syz-executor.2:11277 blocked for more than 143 seconds. Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:23672 pid:11277 ppid:3624 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5191 [inline] __schedule+0x8fc/0xda0 kernel/sched/core.c:6503 schedule+0xcb/0x190 kernel/sched/core.c:6579 wb_wait_for_completion+0x165/0x290 fs/fs-writeback.c:191 __writeback_inodes_sb_nr+0x2f0/0x3d0 fs/fs-writeback.c:2620 try_to_writeback_inodes_sb+0xa5/0xd0 fs/fs-writeback.c:2668 ext4_nonda_switch fs/ext4/inode.c:2950 [inline] ext4_da_write_begin+0x243/0x760 fs/ext4/inode.c:2977 generic_perform_write+0x314/0x610 mm/filemap.c:3753 ext4_buffered_write_iter+0x122/0x3a0 fs/ext4/file.c:285 ext4_file_write_iter+0x1d0/0x18e0 __kernel_write_iter+0x323/0x770 fs/read_write.c:517 dump_emit_page+0xa79/0xca0 fs/coredump.c:857 dump_user_range+0x5b/0xf0 fs/coredump.c:908 elf_core_dump+0x3d5b/0x4570 fs/binfmt_elf.c:2311 do_coredump+0x1874/0x2900 fs/coredump.c:755 get_signal+0x147e/0x1810 kernel/signal.c:2844 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:309 exc_general_protection+0x348/0x4e0 arch/x86/kernel/traps.c:721 asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7f445568b5b1 RSP: 002b:00000000200002c0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f44557abf80 RCX: 00007f445568b5a9 RDX: 0000000020000300 RSI: 00000000200002c0 RDI: 0000000020000000 RBP: 00007f44556e67b0 R08: 0000000020000380 R09: 0000000020000380 R10: 0000000020000340 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffca1262a0f R14: 00007f4456448300 R15: 0000000000022000 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 nmi_cpu_backtrace+0x4e3/0x560 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x19b/0x3e0 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+0xcf5/0xd40 kernel/hung_task.c:377 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 18651 Comm: kworker/u4:7 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Workqueue: phy26 ieee80211_iface_work RIP: 0010:kvfree_call_rcu+0x5f0/0x8c0 Code: 48 89 44 24 10 8b 3d 6f de 5f 0b e8 ca 2c 05 00 bf 08 00 00 00 48 89 de 48 8b 54 24 10 48 89 c1 e8 15 53 e5 ff e9 3a 01 00 00 <48> 8b 44 24 10 48 8d 98 b0 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c RSP: 0018:ffffc9000bcaf160 EFLAGS: 00000002 RAX: 1ffff11017365020 RBX: 1ffff11017365035 RCX: ffffffff81726135 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880b9b28100 RBP: ffffc9000bcaf248 R08: dffffc0000000000 R09: ffffed1017365021 R10: ffffed1017365021 R11: 1ffff11017365020 R12: ffff8880b9b28100 R13: 1ffff92001795e34 R14: 00000000000001f4 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f6a6dea3c0 CR3: 000000000ca8e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cfg80211_update_known_bss+0x16a/0x9e0 cfg80211_bss_update+0x175/0x20b0 net/wireless/scan.c:1727 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2496 [inline] cfg80211_inform_bss_frame_data+0x9f5/0x21a0 net/wireless/scan.c:2529 ieee80211_bss_info_update+0x751/0xfe0 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x1973/0x2cd0 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1630 [inline] ieee80211_iface_work+0x773/0xcf0 net/mac80211/iface.c:1684 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306