------------[ cut here ]------------ WARNING: CPU: 1 PID: 11074 at kernel/rcu/tree_stall.h:648 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:640 [inline] WARNING: CPU: 1 PID: 11074 at kernel/rcu/tree_stall.h:648 rcu_check_gp_start_stall.isra.0+0x1d2/0x2c0 kernel/rcu/tree_stall.h:605 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 11074 Comm: syz-executor.1 Not tainted 5.5.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x3e kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:rcu_check_gp_start_stall kernel/rcu/tree_stall.h:648 [inline] RIP: 0010:rcu_check_gp_start_stall.isra.0+0x1d2/0x2c0 kernel/rcu/tree_stall.h:605 Code: 1d 03 a8 38 08 48 39 da 78 5a be 04 00 00 00 48 c7 c7 c0 29 66 8b e8 ad b2 50 00 b8 01 00 00 00 87 05 02 54 04 0a 85 c0 75 31 <0f> 0b 49 81 fc c0 67 9a 89 74 0c 48 c7 c7 c0 67 9a 89 e8 a7 4a 72 RSP: 0018:ffffc90000da8dc8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 000000010000382b RCX: ffffffff8161d5b3 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8b6629c0 RBP: ffffc90000da8de8 R08: 0000000000000004 R09: fffffbfff16cc539 R10: fffffbfff16cc538 R11: 0000000000000003 R12: ffffffff899a67c0 R13: 1ffffffff1301200 R14: 0000000000000282 R15: ffffffff899a67f8 rcu_core+0x323/0x1540 kernel/rcu/tree.c:2403 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2417 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_acquire+0x20b/0x410 kernel/locking/lockdep.c:4488 Code: 94 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d3 01 00 00 48 83 3d 09 5b 38 08 00 0f 84 53 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b RSP: 0018:ffffc9000d23f5c0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff132669b RBX: ffff88804d81c200 RCX: ffffffff815a7ee0 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: ffffc9000d23f608 R08: 1ffffffff165e79c R09: fffffbfff165e79d R10: ffff88804d81cac0 R11: ffff88804d81c200 R12: ffffffff899a3f00 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002 rcu_lock_acquire include/linux/rcupdate.h:208 [inline] rcu_read_lock include/linux/rcupdate.h:617 [inline] find_get_entry+0xee/0x7a0 mm/filemap.c:1530 pagecache_get_page+0x4c/0x9e0 mm/filemap.c:1635 find_get_page include/linux/pagemap.h:260 [inline] generic_file_buffered_read mm/filemap.c:2047 [inline] generic_file_read_iter+0x722/0x2cf0 mm/filemap.c:2324 ext4_file_read_iter fs/ext4/file.c:130 [inline] ext4_file_read_iter+0x1db/0x640 fs/ext4/file.c:113 call_read_iter include/linux/fs.h:1896 [inline] generic_file_splice_read+0x4af/0x800 fs/splice.c:313 do_splice_to+0x127/0x180 fs/splice.c:892 splice_direct_to_actor+0x320/0xa30 fs/splice.c:971 do_splice_direct+0x1da/0x2a0 fs/splice.c:1080 do_sendfile+0x597/0xd00 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1511 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45aff9 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f02540c7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f02540c86d4 RCX: 000000000045aff9 RDX: 00000000200001c0 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008a2 R14: 00000000004c9bce R15: 000000000075bf2c Kernel Offset: disabled Rebooting in 86400 seconds..