Hi,
I've got the following panic running FreeBSD-11-current:
panic: sleepq_add: td 0xc128a330 to sleep on wchan 0xc1bdd080 with
sleeping prohibited
After some digging, the call stack is the following:
...
g_io_schedule_up()
biodone()
swapgeom_done()
g_waitfor_event()
_sleep()
...
As biodone() in g_io_schedule_up() is wrapped by THREAD_NO_SLEEPING()
and THREAD_SLEEPING_OK(), IMHO, there is something missing in code as
_sleep() can be called regularly in this case.
Svatopluk Kraus
-----------------------------------------
More info about this is bellow:
root@raspberry-pi:/usr/src/src2 # ~~~(da0:umass-sim0:0:0:0): READ(10).
CDB: 28 00 00 12 1c 50 00 00 18 00
(da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI status: Check Condition
(da0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready
to ready change, medium may have changed)
(da0:umass-sim0:0:0:0): Retrying command (per sense data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 12 1c 50 00 00 18 00
(da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI status: Check Condition
(da0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready
to ready change, medium may have changed)
(da0:umass-sim0:0:0:0): Retrying command (per sense data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 12 1c 50 00 00 18 00
(da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI status: Check Condition
(da0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready
to ready change, medium may have changed)
(da0:umass-sim0:0:0:0): Retrying command (per sense data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 12 1c 50 00 00 18 00
(da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI status: Check Condition
(da0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready
to ready change, medium may have changed)
(da0:umass-sim0:0:0:0): Retrying command (per sense data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 12 1c 50 00 00 18 00
(da0:umass-sim0:0:0:0): CAM status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI status: Check Condition
(da0:umass-sim0:0:0:0): SCSI sense: UNIT ATTENTION asc:28,0 (Not ready
to ready change, medium may have changed)
(da0:umass-sim0:0:0:0): Error 6, Retries exhausted
(da0:umass-sim0:0:0:0): Invalidating pack
g_vfs_done():da0s1a[READ(offset=606642176, length=12288)]error = 6
vnode_pager_generic_getpages_done: I/O read error 5
vm_fault: pager read error, pid 327 (dhclient)
pid 327 (dhclient), uid 65: exited on signal 11
swap_pager: I/O error - pagein failed; blkno 57953,size 4096, error 6
panic: sleepq_add: td 0xc128a330 to sleep on wchan 0xc1bdd080 with
sleeping prohibited
KDB: enter: panic
[ thread pid 12 tid 100007 ]
Stopped at kdb_enter+0x48: ldrb r15, [r15, r15, ror r15]!
db> bt
Tracing pid 12 tid 100007 td 0xc128a330
db_trace_self() at db_trace_self
pc = 0xc04ee7cc lr = 0xc0131f90 (db_hex2dec+0x4c0)
sp = 0xcfec2970 fp = 0xcfec2988
r10 = 0xc070f6f8
db_hex2dec() at db_hex2dec+0x4c0
pc = 0xc0131f90 lr = 0xc01319dc (db_command_loop+0x3c4)
sp = 0xcfec2990 fp = 0xcfec2a30
r4 = 0x00000000 r5 = 0x00000000
r6 = 0x00000000 r10 = 0xc070f6f8
db_command_loop() at db_command_loop+0x3c4
pc = 0xc01319dc lr = 0xc0131674 (db_command_loop+0x5c)
sp = 0xcfec2a38 fp = 0xcfec2a48
r4 = 0xc054916d r5 = 0xc0569f39
r6 = 0xc070f6e4 r7 = 0xc0622154
r8 = 0xc07079b0 r9 = 0xc07079b4
r10 = 0xcfec2c10
db_command_loop() at db_command_loop+0x5c
pc = 0xc0131674 lr = 0xc01340c0 (db_fetch_ksymtab+0x298)
sp = 0xcfec2a50 fp = 0xcfec2b68
r4 = 0x00000000 r5 = 0xc070f6f0
r6 = 0xc07079d8 r10 = 0xcfec2c10
db_fetch_ksymtab() at db_fetch_ksymtab+0x298
pc = 0xc01340c0 lr = 0xc02d2eb8 (kdb_trap+0xbc)
sp = 0xcfec2b70 fp = 0xcfec2b90
r4 = 0x00000000 r5 = 0x00000001
r6 = 0xc07079d8 r7 = 0xc0622154
kdb_trap() at kdb_trap+0xbc
pc = 0xc02d2eb8 lr = 0xc0505a08 (undefinedinstruction+0x2b4)
sp = 0xcfec2b98 fp = 0xcfec2c08
r4 = 0x00000000 r5 = 0x00000000
r6 = 0xc05056a4 r7 = 0xe7ffffff
r8 = 0xc128a330 r9 = 0xc02d27b0
r10 = 0xcfec2c10
undefinedinstruction() at undefinedinstruction+0x2b4
pc = 0xc0505a08 lr = 0xc04efe38 (exception_exit)
sp = 0xcfec2c10 fp = 0xcfec2ca8
r4 = 0xc0569f8e r5 = 0xcfec2cfc
r6 = 0xc056f664 r7 = 0xc06f9f18
r8 = 0xc128a330 r9 = 0xc0710e50
r10 = 0xc06f9d80
exception_exit() at exception_exit
pc = 0xc04efe38 lr = 0xc02d27a4 (kdb_enter+0x3c)
sp = 0xcfec2ca0 fp = 0xcfec2ca8
r0 = 0xc07079c4 r1 = 0x00000000
r2 = 0xc056dc29 r3 = 0xc056d86c
r4 = 0xc0569f8e r5 = 0xcfec2cfc
r6 = 0xc056f664 r7 = 0xc06f9f18
r8 = 0xc128a330 r9 = 0xc0710e50
r10 = 0xc06f9d80 r12 = 0x00000000
kdb_enter() at kdb_enter+0x4c
pc = 0xc02d27b4 lr = 0xc02994d4 (kassert_panic+0x1c8)
sp = 0xcfec2cb0 fp = 0xcfec2cd0
r4 = 0x00000100 r10 = 0xc06f9d80
kassert_panic() at kassert_panic+0x1c8
pc = 0xc02994d4 lr = 0xc0299410 (kassert_panic+0x104)
sp = 0xcfec2cd8 fp = 0xcfec2cf0
r4 = 0xc06f9e18 r5 = 0xc056f664
r6 = 0xcfec2cfc r7 = 0xc06f9d80
r8 = 0x00000050 r9 = 0xc0707c68
r10 = 0xc06f7d78
kassert_panic() at kassert_panic+0x104
pc = 0xc0299410 lr = 0xc02e475c (sleepq_add+0x2d4)
sp = 0xcfec2d08 fp = 0xcfec2d30
r4 = 0xc07083fc r5 = 0xc128a330
r6 = 0x00000000 r7 = 0xc1bdd080
sleepq_add() at sleepq_add+0x2d4
pc = 0xc02e475c lr = 0xc02a2374 (_sleep+0x27c)
sp = 0xcfec2d38 fp = 0xcfec2d80
r4 = 0xc0710d40 r5 = 0xc0710d40
r6 = 0xc1bdd080 r7 = 0xffffffa0
r8 = 0x00000000 r9 = 0x00000000
r10 = 0xc06f7d78
_sleep() at _sleep+0x27c
pc = 0xc02a2374 lr = 0xc022badc (g_waitfor_event+0xf0)
sp = 0xcfec2d88 fp = 0xcfec2dc8
r4 = 0xffffffa0 r5 = 0xc06f7d78
r6 = 0x00000000 r7 = 0x00000000
r8 = 0x00040000 r9 = 0x00000100
r10 = 0xc055e43c
g_waitfor_event() at g_waitfor_event+0xf0
pc = 0xc022badc lr = 0xc04ba12c (vmspace_swap_count+0x8d0)
sp = 0xcfec2dd8 fp = 0xcfec2de8
r4 = 0xc21525e8 r5 = 0xc178fd40
r6 = 0xc070df80 r7 = 0xc06f7dd4
r8 = 0xc0710378 r9 = 0xc055c18b
r10 = 0x00000000
vmspace_swap_count() at vmspace_swap_count+0x8d0
pc = 0xc04ba12c lr = 0xc022d000 (g_io_schedule_up+0xd4)
sp = 0xcfec2df0 fp = 0xcfec2e20
r4 = 0xc055e63f r5 = 0xc21525e8
r6 = 0xc06f7d90 r10 = 0x00000000
g_io_schedule_up() at g_io_schedule_up+0xd4
pc = 0xc022d000 lr = 0xc022d738 (g_init+0x220)
sp = 0xcfec2e28 fp = 0xcfec2e30
r4 = 0xc055ea78 r5 = 0xc06f7dfc
r6 = 0xc022d6cc r7 = 0x00000000
r8 = 0xcfec2e58 r9 = 0x00000000
r10 = 0x00000000
g_init() at g_init+0x220
pc = 0xc022d738 lr = 0xc02678a0 (fork_exit+0x7c)
sp = 0xcfec2e38 fp = 0xcfec2e50
r4 = 0xc128a330 r5 = 0xc1287378
fork_exit() at fork_exit+0x7c
pc = 0xc02678a0 lr = 0xc04efdc8 (swi_exit)
sp = 0xcfec2e58 fp = 0x00000000
r4 = 0xc022d6cc r5 = 0x00000000
r6 = 0x00000000 r7 = 0x00000000
r8 = 0x00000000 r10 = 0x00000000
swi_exit() at swi_exit
pc = 0xc04efdc8 lr = 0xc04efdc8 (swi_exit)
sp = 0xcfec2e58 fp = 0x00000000
db> show thread 0xc128a330
Thread 100007 at 0xc128a330:
proc (pid 12): 0xc1287378
name: g_up
stack: 0xcfec1000-0xcfec2fff
flags: 0x1010004 pflags: 0x210000
state: RUNNING (CPU 0)
priority: 92
container lock: sched lock (0xc0707554)
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