INFO: task syz.2.24:5973 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.24 state:D stack:24272 pid:5973 ppid:5775 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1553/0x45a0 kernel/sched/core.c:6700 schedule+0xbd/0x170 kernel/sched/core.c:6774 io_schedule+0x80/0xd0 kernel/sched/core.c:9023 folio_wait_bit_common+0x714/0xfa0 mm/filemap.c:1329 folio_wait_locked include/linux/pagemap.h:1149 [inline] gfs2_jhead_process_page+0x17e/0x720 fs/gfs2/lops.c:477 gfs2_find_jhead+0xbe5/0xd20 fs/gfs2/lops.c:594 check_journal_clean+0x1c6/0x360 fs/gfs2/util.c:76 init_journal+0x1802/0x2330 fs/gfs2/ops_fstype.c:828 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:886 gfs2_fill_super+0x17bc/0x1f30 fs/gfs2/ops_fstype.c:1266 get_tree_bdev+0x3f3/0x520 fs/super.c:1591 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1344 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3386 do_mount fs/namespace.c:3726 [inline] __do_sys_mount fs/namespace.c:3935 [inline] __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f11c5f9c14a RSP: 002b:00007f11c6ebbe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f11c6ebbee0 RCX: 00007f11c5f9c14a RDX: 000020000001f680 RSI: 000020000001f6c0 RDI: 00007f11c6ebbea0 RBP: 000020000001f680 R08: 00007f11c6ebbee0 R09: 0000000000000084 R10: 0000000000000084 R11: 0000000000000246 R12: 000020000001f6c0 R13: 00007f11c6ebbea0 R14: 000000000001f748 R15: 0000200000000080 Showing all locks held in the system: 1 lock held by pool_workqueue_/3: 1 lock held by khungtaskd/29: #0: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8d131fe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633 2 locks held by getty/5527: #0: ffff88802de160a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000328b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217 2 locks held by udevd/5768: 1 lock held by syz.2.24/5973: #0: ffff88807edea0e0 (&type->s_umount_key#66){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807edea0e0 (&type->s_umount_key#66){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807edea0e0 (&type->s_umount_key#66){+.+.}-{3:3}, at: get_tree_bdev+0x353/0x520 fs/super.c:1589 1 lock held by syz.3.328/7963: #0: ffffffff8d1379b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline] #0: ffffffff8d1379b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3da/0x880 kernel/rcu/tree_exp.h:1004 2 locks held by syz.8.335/8000: 2 locks held by udevadm/8029: 1 lock held by dhcpcd-run-hook/8030: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xf3d/0xf80 kernel/hung_task.c:379 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8029 Comm: udevadm Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:down_read_trylock+0x0/0x3b0 kernel/locking/rwsem.c:1558 Code: 00 00 5b 41 5c 41 5e 41 5f c3 89 d9 80 e1 07 80 c1 03 38 c1 7c e6 48 89 df e8 cc bc 77 00 eb dc 66 2e 0f 1f 84 00 00 00 00 00 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 RSP: 0000:ffffc9000440fd38 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 1ffff1104779ac06 RCX: 0000000000000000 RDX: ffff8880246f1e00 RSI: 0000000000000034 RDI: ffff88805fc69d80 RBP: ffffc9000440fe58 R08: ffff8880246f1e00 R09: 0000000000000003 R10: 0000000000000009 R11: 0000000000000000 R12: 1ffff1104779ac02 R13: 1ffff1104779ac05 R14: ffff88823bcd6010 R15: ffff88823bcd6030 FS: 00007fb31813d880(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb318131008 CR3: 0000000078068000 CR4: 00000000003506f0 Call Trace: vma_start_read include/linux/mm.h:669 [inline] lock_vma_under_rcu+0x250/0x680 mm/memory.c:5509 do_user_addr_fault+0x318/0x12c0 arch/x86/mm/fault.c:1314 handle_page_fault arch/x86/mm/fault.c:1463 [inline] exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0033:0x7fb3182128ec Code: 1f 80 00 00 00 00 48 8b 31 8b 51 08 4c 01 fe 48 83 fa 26 74 0a 48 83 fa 08 0f 85 ef 3c ff ff 48 8b 51 10 48 83 c1 18 4c 01 fa <48> 89 16 48 39 d9 72 d4 4d 8b 9a 08 02 00 00 4d 85 db 0f 84 ec 0b RSP: 002b:00007ffc0f156a90 EFLAGS: 00010206 RAX: 00007fb317c14308 RBX: 00007fb317cc90c0 RCX: 00007fb317cbe230 RDX: 00007fb317f71060 RSI: 00007fb318131008 RDI: 00007fb317cc9fc0 RBP: 00007ffc0f156bb0 R08: 00007fb317cc9180 R09: 00007fb317cc9fc0 R10: 00007fb318204580 R11: 0000000000000000 R12: 00007ffc0f156b40 R13: 00007ffc0f156b40 R14: 00007fb318204580 R15: 00007fb317c00000