BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor557/4058 caller is dev_core_stats include/linux/netdevice.h:3853 [inline] caller is dev_core_stats_rx_dropped_inc include/linux/netdevice.h:3866 [inline] caller is tun_get_user+0x18f5/0x3120 drivers/net/tun.c:1844 CPU: 1 PID: 4058 Comm: syz-executor557 Not tainted 5.17.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 check_preemption_disabled+0xd9/0xe0 lib/smp_processor_id.c:49 dev_core_stats include/linux/netdevice.h:3853 [inline] dev_core_stats_rx_dropped_inc include/linux/netdevice.h:3866 [inline] tun_get_user+0x18f5/0x3120 drivers/net/tun.c:1844 tun_chr_write_iter+0xbd/0x1b0 drivers/net/tun.c:2015 call_write_iter include/linux/fs.h:2074 [inline] new_sync_write+0x368/0x600 fs/read_write.c:503 vfs_write+0x609/0x900 fs/read_write.c:590 ksys_write+0xf4/0x1d0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f08e0671ba3 Code: 5d 41 5c 41 5d 41 5e e9 9b fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18 RSP: 002b:00007fff463f76f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f08e0671ba3 RDX: 00000000000020a7 RSI: 0000000020000000 RDI: 00000000000000c8 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fff463f7170 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000ff08 R13: 00007fff463f7720 R14: 00007fff463f7710 R15: 00007fff463f7704