watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz.4.340:8281] Modules linked in: irq event stamp: 4909 hardirqs last enabled at (4908): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:85 [inline] hardirqs last enabled at (4908): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:95 hardirqs last disabled at (4909): [] __el1_irq arch/arm64/kernel/entry-common.c:557 [inline] hardirqs last disabled at (4909): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:575 softirqs last enabled at (278): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (288): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (288): [] sock_devmem_dontneed+0x1d8/0x5fc net/core/sock.c:1086 CPU: 0 UID: 0 PID: 8281 Comm: syz.4.340 Not tainted 6.12.0-rc6-syzkaller-g46f782153ea2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : arch_local_irq_restore+0x8/0xc arch/arm64/include/asm/irqflags.h:197 lr : lock_is_held_type+0x150/0x1a8 kernel/locking/lockdep.c:5899 sp : ffff80009f6074f0 x29: ffff80009f6074f0 x28: 1ffff00013ec0ee0 x27: 0000000000000000 x26: ffff0000dd025ac0 x25: ffff80008f75f4c0 x24: ffff80008f8be1e0 x23: 0000000000000000 x22: ffff0000dd026540 x21: ffff0000dbda2d98 x20: 0000000000000001 x19: 0000000000000000 x18: ffff80009f6074a0 x17: 0000000000040da3 x16: ffff80008035a664 x15: 0000000000000003 x14: 1ffff00013ec0ee4 x13: 0000000000000000 x12: 0000000000000000 x11: ffff700013ec0ee7 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000010 x2 : 0000000000000008 x1 : ffff80008b626140 x0 : 0000000000000000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore+0x8/0xc arch/arm64/include/asm/irqflags.h:195 (P) lock_is_held_type+0x150/0x1a8 kernel/locking/lockdep.c:5899 (L) lock_is_held include/linux/lockdep.h:249 [inline] xa_head include/linux/xarray.h:1204 [inline] xas_start+0x1bc/0x6c4 lib/xarray.c:190 xas_load+0x3c/0x50c lib/xarray.c:238 xas_store+0x94/0x1470 lib/xarray.c:790 __xa_erase+0x11c/0x1e0 lib/xarray.c:1511 sock_devmem_dontneed+0x2a0/0x5fc net/core/sock.c:1089 sk_setsockopt+0x7b4/0x3150 net/core/sock.c:1280 sock_setsockopt+0x68/0x80 net/core/sock.c:1633 do_sock_setsockopt+0x238/0x4e0 net/socket.c:2330 __sys_setsockopt+0x128/0x1a8 net/socket.c:2357 __do_sys_setsockopt net/socket.c:2366 [inline] __se_sys_setsockopt net/socket.c:2363 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2363 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8246 Comm: syz.4.340 Not tainted 6.12.0-rc6-syzkaller-g46f782153ea2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x15c/0xd00 kernel/locking/qspinlock.c:380 lr : queued_spin_lock_slowpath+0x168/0xd00 kernel/locking/qspinlock.c:380 sp : ffff8000a61d75c0 x29: ffff8000a61d7660 x28: 1fffe0001b7b45b0 x27: 1ffff00014c3aec4 x26: dfff800000000000 x25: 1fffe00018a9c3ca x24: ffff8000a61d75e0 x23: ffff8000a61d7620 x22: ffff700014c3aebc x21: 0000000000000001 x20: 0000000000000001 x19: ffff0000dbda2d80 x18: 0000000000000000 x17: 0000000000000000 x16: ffff800080acd16c x15: 0000000000000001 x14: 1fffe0001b7b45b0 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001b7b45b1 x10: 1fffe0001b7b45b0 x9 : 0000000000000000 x8 : 0000000000000001 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008b5a3694 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] (P) queued_spin_lock_slowpath+0x15c/0xd00 kernel/locking/qspinlock.c:380 (P) queued_spin_lock_slowpath+0x168/0xd00 kernel/locking/qspinlock.c:380 (L) queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2ec/0x334 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_devmem_dontneed+0x1d8/0x5fc net/core/sock.c:1086 sk_setsockopt+0x7b4/0x3150 net/core/sock.c:1280 sock_setsockopt+0x68/0x80 net/core/sock.c:1633 do_sock_setsockopt+0x238/0x4e0 net/socket.c:2330 __sys_setsockopt+0x128/0x1a8 net/socket.c:2357 __do_sys_setsockopt net/socket.c:2366 [inline] __se_sys_setsockopt net/socket.c:2363 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2363 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 vkms_vblank_simulate: vblank timer overrun