watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.0:4685] Modules linked in: irq event stamp: 4594099 hardirqs last enabled at (4594098): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (4594099): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1106 softirqs last enabled at (4579544): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (4579547): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 4685 Comm: syz-executor.0 Not tainted 5.10.234 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:68 Code: 0a fe ff ff e8 0e 45 5c 00 e9 bf fd ff ff e8 04 45 5c 00 e9 8c fd ff ff e8 fa 44 5c 00 e9 44 fd ff ff cc cc cc cc cc 48 8b 07 88 d4 0f 03 0f 1f 84 00 00 00 00 00 41 57 89 d0 41 56 41 55 41 RSP: 0018:ffff88806ce09630 EFLAGS: 00000283 RAX: ffff88802030ff58 RBX: ffff88806ce09780 RCX: ffff88806ce09780 RDX: dffffc0000000000 RSI: ffff88802030ff18 RDI: ffff88802030ff18 RBP: ffff88802030ff18 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000032042 R11: 1ffff1100d9c12d5 R12: ffff88806ce09740 R13: ffff888020308000 R14: 1ffff1100d9c12d5 R15: ffffffff85a1e830 FS: 00007fac585b2700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cf26000 CR3: 0000000048d3c000 CR4: 0000000000350ef0 Call Trace: deref_stack_reg+0xf2/0x160 arch/x86/kernel/unwind_orc.c:360 unwind_next_frame+0x1289/0x1a90 arch/x86/kernel/unwind_orc.c:589 arch_stack_walk+0x83/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc9/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:532 [inline] slab_alloc_node mm/slub.c:2896 [inline] kmem_cache_alloc_node+0x14b/0x330 mm/slub.c:2932 __alloc_skb+0x6d/0x5b0 net/core/skbuff.c:200 __netdev_alloc_skb+0x6e/0x360 net/core/skbuff.c:448 netdev_alloc_skb include/linux/skbuff.h:2855 [inline] dev_alloc_skb include/linux/skbuff.h:2868 [inline] __ieee80211_beacon_get+0x3af/0x1440 net/mac80211/tx.c:4876 ieee80211_beacon_get_tim+0x88/0x9f0 net/mac80211/tx.c:4990 ieee80211_beacon_get include/net/mac80211.h:4912 [inline] mac80211_hwsim_beacon_tx+0x111/0x940 drivers/net/wireless/mac80211_hwsim.c:1740 __iterate_interfaces+0x1f0/0x550 net/mac80211/util.c:792 ieee80211_iterate_active_interfaces_atomic+0x71/0x1c0 net/mac80211/util.c:828 mac80211_hwsim_beacon+0xd1/0x1d0 drivers/net/wireless/mac80211_hwsim.c:1793 __run_hrtimer kernel/time/hrtimer.c:1586 [inline] __hrtimer_run_queues+0x632/0xb40 kernel/time/hrtimer.c:1650 hrtimer_run_softirq+0x148/0x310 kernel/time/hrtimer.c:1667 __do_softirq+0x1b8/0x7c9 kernel/softirq.c:298 asm_call_irq_on_stack+0x12/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x80/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x114/0x1b0 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x43/0xa0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:ext4_inode_csum_set fs/ext4/inode.c:116 [inline] RIP: 0010:ext4_inode_csum_set+0x1b5/0x360 fs/ext4/inode.c:104 Code: 83 c0 01 38 d0 7c 08 84 d2 0f 85 53 01 00 00 4c 89 fa 66 41 89 6c 24 7c 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 85 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 28 48 8d RSP: 0018:ffff88802030ef50 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff88801d73c820 RCX: ffffc90001c19000 RDX: 1ffff11003ae7909 RSI: ffffffff8199eb7a RDI: ffff8880466da17c RBP: 00000000d206536a R08: 00000000eec5cba2 R09: 000000000435cd0b R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880466da100 R13: ffff88800fa72000 R14: 0000000000000000 R15: ffff88801d73c848 ext4_do_update_inode fs/ext4/inode.c:5249 [inline] ext4_mark_iloc_dirty+0x18dc/0x3630 fs/ext4/inode.c:5841 __ext4_mark_inode_dirty+0x20a/0x770 fs/ext4/inode.c:6043 ext4_dirty_inode+0xf3/0x130 fs/ext4/inode.c:6079 __mark_inode_dirty+0x492/0xd40 fs/fs-writeback.c:2252 mark_inode_dirty_sync include/linux/fs.h:2329 [inline] dquot_free_space include/linux/quotaops.h:382 [inline] dquot_free_block include/linux/quotaops.h:392 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:5618 [inline] ext4_free_blocks+0x1cba/0x21f0 fs/ext4/mballoc.c:5748 ext4_xattr_release_block+0x3a3/0x910 fs/ext4/xattr.c:1260 ext4_xattr_block_set+0x1f99/0x3040 fs/ext4/xattr.c:2152 ext4_xattr_set_handle+0x1037/0x1320 fs/ext4/xattr.c:2377 ext4_xattr_set+0x13a/0x340 fs/ext4/xattr.c:2504 __vfs_removexattr+0xf9/0x170 fs/xattr.c:441 cap_inode_killpriv+0x19/0x50 security/commoncap.c:316 security_inode_killpriv+0x46/0xa0 security/security.c:1373 setattr_prepare+0x19f/0x7c0 fs/attr.c:168 ext4_setattr+0x199/0x20f0 fs/ext4/inode.c:5451 notify_change+0xc28/0x1160 fs/attr.c:410 __remove_privs fs/inode.c:1970 [inline] file_remove_privs+0x364/0x520 fs/inode.c:1997 file_modified+0x14/0xa0 fs/inode.c:2062 ext4_dio_write_checks fs/ext4/file.c:427 [inline] ext4_dio_write_iter fs/ext4/file.c:491 [inline] ext4_file_write_iter+0x8f8/0x1530 fs/ext4/file.c:660 call_write_iter include/linux/fs.h:2039 [inline] new_sync_write+0x42c/0x660 fs/read_write.c:518 vfs_write+0x7c0/0xb10 fs/read_write.c:605 ksys_write+0x12d/0x260 fs/read_write.c:658 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 RIP: 0033:0x7fac5b03cb19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fac585b2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fac5b14ff60 RCX: 00007fac5b03cb19 RDX: 000000000000000b RSI: 0000000020000300 RDI: 0000000000000004 RBP: 00007fac5b096f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc1025369f R14: 00007fac585b2300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0xe/0x20 arch/x86/kernel/process.c:706 EXT4-fs warning (device sda): verify_group_input:146: Cannot add at group 256 (only 16 groups) EXT4-fs warning (device sda): verify_group_input:146: Cannot add at group 256 (only 16 groups) loop2: detected capacity change from 0 to 46080 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: e8 0e 45 5c 00 callq 0x5c4513 5: e9 bf fd ff ff jmpq 0xfffffdc9 a: e8 04 45 5c 00 callq 0x5c4513 f: e9 8c fd ff ff jmpq 0xfffffda0 14: e8 fa 44 5c 00 callq 0x5c4513 19: e9 44 fd ff ff jmpq 0xfffffd62 1e: cc int3 1f: cc int3 20: cc int3 21: cc int3 22: cc int3 23: 48 8b 07 mov (%rdi),%rax * 26: e9 88 d4 0f 03 jmpq 0x30fd4b3 <-- trapping instruction 2b: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 32: 00 33: 41 57 push %r15 35: 89 d0 mov %edx,%eax 37: 41 56 push %r14 39: 41 55 push %r13 3b: 41 rex.B